123687993 has 16 divisors (see below), whose sum is σ = 193749696. Its totient is φ = 69195840.

The previous prime is 123687983. The next prime is 123688027. The reversal of 123687993 is 399786321.

It is not a de Polignac number, because 123687993 - 2⁹ = 123687481 is a prime.

It is a super-2 number, since 2×123687993² = 30597439224736098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123687913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143730 + ... + 144587.

It is an arithmetic number, because the mean of its divisors is an integer number (12109356).

Almost surely, 2^123687993 is an apocalyptic number.

123687993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123687993 is a deficient number, since it is larger than the sum of its proper divisors (70061703).

123687993 is a wasteful number, since it uses less digits than its factorization.

123687993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288344.

The product of its digits is 489888, while the sum is 48.

The square root of 123687993 is about 11121.5103740454. The cubic root of 123687993 is about 498.2445009932.

The spelling of 123687993 in words is "one hundred twenty-three million, six hundred eighty-seven thousand, nine hundred ninety-three".