123855015 has 32 divisors (see below), whose sum is σ = 211276800. Its totient is φ = 61776000.

The previous prime is 123855001. The next prime is 123855019. The reversal of 123855015 is 510558321.

It is not a de Polignac number, because 123855015 - 2⁴ = 123854999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123855019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19765 + ... + 25265.

It is an arithmetic number, because the mean of its divisors is an integer number (6602400).

Almost surely, 2^123855015 is an apocalyptic number.

123855015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123855015 is a deficient number, since it is larger than the sum of its proper divisors (87421785).

123855015 is a wasteful number, since it uses less digits than its factorization.

123855015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 123855015 is about 11129.0168029346. The cubic root of 123855015 is about 498.4686681669.

The spelling of 123855015 in words is "one hundred twenty-three million, eight hundred fifty-five thousand, fifteen".