1238738920 has 32 divisors (see below), whose sum is σ = 2877073920. Its totient is φ = 479511360.

The previous prime is 1238738887. The next prime is 1238738923. The reversal of 1238738920 is 298378321.

It is a super-2 number, since 2×1238738920² = 3068948223845532800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1238738923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498252 + ... + 500731.

It is an arithmetic number, because the mean of its divisors is an integer number (89908560).

Almost surely, 2^1238738920 is an apocalyptic number.

1238738920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1238738920 is an abundant number, since it is smaller than the sum of its proper divisors (1638335000).

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

1238738920 is a wasteful number, since it uses less digits than its factorization.

1238738920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999025 (or 999021 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1238738920 is about 35195.7230356190. The cubic root of 1238738920 is about 1073.9727471882.

The spelling of 1238738920 in words is "one billion, two hundred thirty-eight million, seven hundred thirty-eight thousand, nine hundred twenty".