1239633920 has 104 divisors (see below), whose sum is σ = 3400116864. Its totient is φ = 424968192.

The previous prime is 1239633911. The next prime is 1239633937. The reversal of 1239633920 is 293369321.

It is a super-2 number, since 2×1239633920² = 3073384511229132800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139037 + ... + 147683.

Almost surely, 2^1239633920 is an apocalyptic number.

1239633920 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 1239633920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1700058432).

1239633920 is an abundant number, since it is smaller than the sum of its proper divisors (2160482944).

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

1239633920 is an frugal number, since it uses more digits than its factorization.

1239633920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8683 (or 8661 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 1239633920 is about 35208.4353529094. The cubic root of 1239633920 is about 1074.2313365737.

The spelling of 1239633920 in words is "one billion, two hundred thirty-nine million, six hundred thirty-three thousand, nine hundred twenty".