123791220 has 96 divisors (see below), whose sum is σ = 440160000. Its totient is φ = 28294272.

The previous prime is 123791197. The next prime is 123791231. The reversal of 123791220 is 22197321.

It is a super-2 number, since 2×123791220² = 30648532298176800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12595 + ... + 20154.

It is an arithmetic number, because the mean of its divisors is an integer number (4585000).

Almost surely, 2^123791220 is an apocalyptic number.

123791220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123791220 is an abundant number, since it is smaller than the sum of its proper divisors (316368780).

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

123791220 is a wasteful number, since it uses less digits than its factorization.

123791220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32774 (or 32766 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 123791220 is about 11126.1502776117. The cubic root of 123791220 is about 498.3830700449.

The spelling of 123791220 in words is "one hundred twenty-three million, seven hundred ninety-one thousand, two hundred twenty".