123391820 has 12 divisors (see below), whose sum is σ = 259122864. Its totient is φ = 49356720.

The previous prime is 123391813. The next prime is 123391843. The reversal of 123391820 is 28193321.

It is a super-3 number, since 3×123391820³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3084776 + ... + 3084815.

It is an arithmetic number, because the mean of its divisors is an integer number (21593572).

Almost surely, 2^123391820 is an apocalyptic number.

123391820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123391820 is an abundant number, since it is smaller than the sum of its proper divisors (135731044).

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

123391820 is a wasteful number, since it uses less digits than its factorization.

123391820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6169600 (or 6169598 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 123391820 is about 11108.1870708050. The cubic root of 123391820 is about 497.8464981758.

The spelling of 123391820 in words is "one hundred twenty-three million, three hundred ninety-one thousand, eight hundred twenty".