123813978 has 32 divisors (see below), whose sum is σ = 252745920. Its totient is φ = 40423680.

The previous prime is 123813971. The next prime is 123813979. The reversal of 123813978 is 879318321.

It is a super-2 number, since 2×123813978² = 30659802296368968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123813971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140098 + ... + 140978.

It is an arithmetic number, because the mean of its divisors is an integer number (7898310).

Almost surely, 2^123813978 is an apocalyptic number.

123813978 is an abundant number, since it is smaller than the sum of its proper divisors (128931942).

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

123813978 is a wasteful number, since it uses less digits than its factorization.

123813978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342.

The product of its digits is 72576, while the sum is 42.

The square root of 123813978 is about 11127.1729563263. The cubic root of 123813978 is about 498.4136093861.

The spelling of 123813978 in words is "one hundred twenty-three million, eight hundred thirteen thousand, nine hundred seventy-eight".