123921556 has 12 divisors (see below), whose sum is σ = 236577600. Its totient is φ = 56327960.

The previous prime is 123921527. The next prime is 123921559. The reversal of 123921556 is 655129321.

It is a super-2 number, since 2×123921556² = 30713104082922272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123921559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408156 + ... + 1408243.

It is an arithmetic number, because the mean of its divisors is an integer number (19714800).

Almost surely, 2^123921556 is an apocalyptic number.

It is an amenable number.

123921556 is a deficient number, since it is larger than the sum of its proper divisors (112656044).

123921556 is a wasteful number, since it uses less digits than its factorization.

123921556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816414 (or 2816412 counting only the distinct ones).

The product of its digits is 16200, while the sum is 34.

The square root of 123921556 is about 11132.0059288522. The cubic root of 123921556 is about 498.5579194728.

The spelling of 123921556 in words is "one hundred twenty-three million, nine hundred twenty-one thousand, five hundred fifty-six".