123156870 has 16 divisors (see below), whose sum is σ = 295576560. Its totient is φ = 32841824.

The previous prime is 123156821. The next prime is 123156871. The reversal of 123156870 is 78651321.

It is a super-2 number, since 2×123156870² = 30335229256393800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123156871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052585 + ... + 2052644.

It is an arithmetic number, because the mean of its divisors is an integer number (18473535).

Almost surely, 2^123156870 is an apocalyptic number.

123156870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123156870 is an abundant number, since it is smaller than the sum of its proper divisors (172419690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123156870 is a wasteful number, since it uses less digits than its factorization.

123156870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105239.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 123156870 is about 11097.6064987005. The cubic root of 123156870 is about 497.5303147273.

The spelling of 123156870 in words is "one hundred twenty-three million, one hundred fifty-six thousand, eight hundred seventy".