123887631 has 24 divisors (see below), whose sum is σ = 192682800. Its totient is φ = 70597632.

The previous prime is 123887627. The next prime is 123887639. The reversal of 123887631 is 136788321.

It is not a de Polignac number, because 123887631 - 2² = 123887627 is a prime.

It is a super-2 number, since 2×123887631² = 30696290229584322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123887631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123887639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65065 + ... + 66941.

It is an arithmetic number, because the mean of its divisors is an integer number (8028450).

Almost surely, 2^123887631 is an apocalyptic number.

123887631 is a deficient number, since it is larger than the sum of its proper divisors (68795169).

123887631 is a wasteful number, since it uses less digits than its factorization.

123887631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343 (or 2336 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 123887631 is about 11130.4820650320. The cubic root of 123887631 is about 498.5124199336.

The spelling of 123887631 in words is "one hundred twenty-three million, eight hundred eighty-seven thousand, six hundred thirty-one".