123438820 has 24 divisors (see below), whose sum is σ = 272865600. Its totient is φ = 46776672.

The previous prime is 123438803. The next prime is 123438851. The reversal of 123438820 is 28834321.

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, 162040 + ... + 162799.

It is an arithmetic number, because the mean of its divisors is an integer number (11369400).

Almost surely, 2^123438820 is an apocalyptic number.

123438820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123438820 is an abundant number, since it is smaller than the sum of its proper divisors (149426780).

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

123438820 is a wasteful number, since it uses less digits than its factorization.

123438820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324867 (or 324865 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 123438820 is about 11110.3024261268. The cubic root of 123438820 is about 497.9097001373.

The spelling of 123438820 in words is "one hundred twenty-three million, four hundred thirty-eight thousand, eight hundred twenty".