123131604 has 24 divisors (see below), whose sum is σ = 299799360. Its totient is φ = 39259264.

The previous prime is 123131551. The next prime is 123131623. The reversal of 123131604 is 406131321.

It is a super-2 number, since 2×123131604² = 30322783807225632, which contains 22 as substring.

It is a congruent number.

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, 222789 + ... + 223340.

It is an arithmetic number, because the mean of its divisors is an integer number (12491640).

Almost surely, 2^123131604 is an apocalyptic number.

It is an amenable number.

123131604 is an abundant number, since it is smaller than the sum of its proper divisors (176667756).

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

123131604 is a wasteful number, since it uses less digits than its factorization.

123131604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446159 (or 446157 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 123131604 is about 11096.4680867382. The cubic root of 123131604 is about 497.4962891233.

Adding to 123131604 its reverse (406131321), we get a palindrome (529262925).

The spelling of 123131604 in words is "one hundred twenty-three million, one hundred thirty-one thousand, six hundred four".