1229900 has 54 divisors (see below), whose sum is σ = 3116988. Its totient is φ = 420000.

The previous prime is 1229897. The next prime is 1229903. The reversal of 1229900 is 99221.

It is an interprime number because it is at equal distance from previous prime (1229897) and next prime (1229903).

It is not an unprimeable number, because it can be changed into a prime (1229903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4775 + ... + 5025.

It is an arithmetic number, because the mean of its divisors is an integer number (57722).

2^1229900 is an apocalyptic number.

1229900 is a gapful number since it is divisible by the number (10) 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 1229900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558494).

1229900 is an abundant number, since it is smaller than the sum of its proper divisors (1887088).

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

1229900 is a wasteful number, since it uses less digits than its factorization.

1229900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1229900 is about 1109.0085662428. The cubic root of 1229900 is about 107.1412232555.

The spelling of 1229900 in words is "one million, two hundred twenty-nine thousand, nine hundred".