12537978 has 16 divisors (see below), whose sum is σ = 25451040. Its totient is φ = 4116816.

The previous prime is 12537977. The next prime is 12537989. The reversal of 12537978 is 87973521.

It is not an unprimeable number, because it can be changed into a prime (12537971) 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, 15193 + ... + 15996.

It is an arithmetic number, because the mean of its divisors is an integer number (1590690).

Almost surely, 2^12537978 is an apocalyptic number.

12537978 is an abundant number, since it is smaller than the sum of its proper divisors (12913062).

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

12537978 is a wasteful number, since it uses less digits than its factorization.

12537978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31261.

The product of its digits is 105840, while the sum is 42.

The square root of 12537978 is about 3540.9007328645. The cubic root of 12537978 is about 232.3142417289.

The spelling of 12537978 in words is "twelve million, five hundred thirty-seven thousand, nine hundred seventy-eight".