1229903028 has 90 divisors (see below), whose sum is σ = 3293324034. Its totient is φ = 400238496.

The previous prime is 1229903023. The next prime is 1229903033. The reversal of 1229903028 is 8203099221.

It is an interprime number because it is at equal distance from previous prime (1229903023) and next prime (1229903033).

It can be written as a sum of positive squares in only one way, i.e., 1056770064 + 173132964 = 32508^2 + 13158^2 .

It is a super-2 number, since 2×1229903028² = 3025322916567137568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1229902983 and 1229903001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229903023) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 598050 + ... + 600102.

Almost surely, 2^1229903028 is an apocalyptic number.

1229903028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229903028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1646662017).

1229903028 is an abundant number, since it is smaller than the sum of its proper divisors (2063421006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1229903028 is a wasteful number, since it uses less digits than its factorization.

1229903028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155 (or 2101 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1229903028 is about 35069.9733105117. The cubic root of 1229903028 is about 1071.4131118226.

The spelling of 1229903028 in words is "one billion, two hundred twenty-nine million, nine hundred three thousand, twenty-eight".