1239623028 has 120 divisors (see below), whose sum is σ = 3794180544. Its totient is φ = 345513600.

The previous prime is 1239623027. The next prime is 1239623039. The reversal of 1239623028 is 8203269321.

1239623028 is a `hidden beast` number, since 1 + 2 + 3 + 9 + 623 + 0 + 28 = 666.

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 = 1239622983 and 1239623001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239623027) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 86323 + ... + 99653.

Almost surely, 2^1239623028 is an apocalyptic number.

1239623028 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 1239623028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897090272).

1239623028 is an abundant number, since it is smaller than the sum of its proper divisors (2554557516).

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

1239623028 is a wasteful number, since it uses less digits than its factorization.

1239623028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13395 (or 13384 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1239623028 is about 35208.2806737279. The cubic root of 1239623028 is about 1074.2281903325.

The spelling of 1239623028 in words is "one billion, two hundred thirty-nine million, six hundred twenty-three thousand, twenty-eight".