123155715 has 48 divisors (see below), whose sum is σ = 209986560. Its totient is φ = 61554240.

The previous prime is 123155713. The next prime is 123155717. The reversal of 123155715 is 517551321.

It is an interprime number because it is at equal distance from previous prime (123155713) and next prime (123155717).

It is not a de Polignac number, because 123155715 - 2¹ = 123155713 is a prime.

It is a super-2 number, since 2×123155715² = 30334660274322450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123155713) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1838112 + ... + 1838178.

It is an arithmetic number, because the mean of its divisors is an integer number (4374720).

Almost surely, 2^123155715 is an apocalyptic number.

123155715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123155715 is a deficient number, since it is larger than the sum of its proper divisors (86830845).

123155715 is an equidigital number, since it uses as much as digits as its factorization.

123155715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 165 counting only the distinct ones).

The product of its digits is 5250, while the sum is 30.

The square root of 123155715 is about 11097.5544603304. The cubic root of 123155715 is about 497.5287593957.

The spelling of 123155715 in words is "one hundred twenty-three million, one hundred fifty-five thousand, seven hundred fifteen".