13978574 has 4 divisors (see below), whose sum is σ = 20967864. Its totient is φ = 6989286.

The previous prime is 13978571. The next prime is 13978619. The reversal of 13978574 is 47587931.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494642 + ... + 3494645.

It is an arithmetic number, because the mean of its divisors is an integer number (5241966).

Almost surely, 2^13978574 is an apocalyptic number.

13978574 is a deficient number, since it is larger than the sum of its proper divisors (6989290).

13978574 is an equidigital number, since it uses as much as digits as its factorization.

13978574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6989289.

The product of its digits is 211680, while the sum is 44.

The square root of 13978574 is about 3738.7931207811. The cubic root of 13978574 is about 240.8912119551.

The spelling of 13978574 in words is "thirteen million, nine hundred seventy-eight thousand, five hundred seventy-four".