13071978 has 12 divisors (see below), whose sum is σ = 28322658. Its totient is φ = 4357320.

The previous prime is 13071967. The next prime is 13071979. The reversal of 13071978 is 87917031.

It can be written as a sum of positive squares in only one way, i.e., 7469289 + 5602689 = 2733^2 + 2367^2 .

It is not an unprimeable number, because it can be changed into a prime (13071979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363093 + ... + 363128.

Almost surely, 2^13071978 is an apocalyptic number.

13071978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13071978 is an abundant number, since it is smaller than the sum of its proper divisors (15250680).

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

13071978 is a wasteful number, since it uses less digits than its factorization.

13071978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726229 (or 726226 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 13071978 is about 3615.5190498738. The cubic root of 13071978 is about 235.5666302330.

The spelling of 13071978 in words is "thirteen million, seventy-one thousand, nine hundred seventy-eight".