13125978 has 24 divisors (see below), whose sum is σ = 28506816. Its totient is φ = 4365000.

The previous prime is 13125971. The next prime is 13125991. The reversal of 13125978 is 87952131.

It is not an unprimeable number, because it can be changed into a prime (13125971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13033 + ... + 14003.

It is an arithmetic number, because the mean of its divisors is an integer number (1187784).

Almost surely, 2^13125978 is an apocalyptic number.

13125978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13125978 is an abundant number, since it is smaller than the sum of its proper divisors (15380838).

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

13125978 is a wasteful number, since it uses less digits than its factorization.

13125978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 1727 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 13125978 is about 3622.9791608564. The cubic root of 13125978 is about 235.8905577969.

The spelling of 13125978 in words is "thirteen million, one hundred twenty-five thousand, nine hundred seventy-eight".