123813887 has 4 divisors (see below), whose sum is σ = 124717776. Its totient is φ = 122910000.

The previous prime is 123813871. The next prime is 123813901. The reversal of 123813887 is 788318321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123813887 - 2⁴ = 123813871 is a prime.

It is a super-2 number, since 2×123813887² = 30659757228097538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123813817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451739 + ... + 452012.

It is an arithmetic number, because the mean of its divisors is an integer number (31179444).

Almost surely, 2^123813887 is an apocalyptic number.

123813887 is a deficient number, since it is larger than the sum of its proper divisors (903889).

123813887 is an equidigital number, since it uses as much as digits as its factorization.

123813887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903888.

The product of its digits is 64512, while the sum is 41.

The square root of 123813887 is about 11127.1688672366. The cubic root of 123813887 is about 498.4134872792.

The spelling of 123813887 in words is "one hundred twenty-three million, eight hundred thirteen thousand, eight hundred eighty-seven".