123640315 has 16 divisors (see below), whose sum is σ = 159505920. Its totient is φ = 91709280.

The previous prime is 123640301. The next prime is 123640339. The reversal of 123640315 is 513046321.

It is a de Polignac number, because none of the positive numbers 2^k-123640315 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123640315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9381 + ... + 18310.

It is an arithmetic number, because the mean of its divisors is an integer number (9969120).

Almost surely, 2^123640315 is an apocalyptic number.

123640315 is a deficient number, since it is larger than the sum of its proper divisors (35865605).

123640315 is a wasteful number, since it uses less digits than its factorization.

123640315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27762.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 123640315 is about 11119.3666636189. The cubic root of 123640315 is about 498.1804733440.

Adding to 123640315 its reverse (513046321), we get a palindrome (636686636).

The spelling of 123640315 in words is "one hundred twenty-three million, six hundred forty thousand, three hundred fifteen".