13815974 has 4 divisors (see below), whose sum is σ = 20723964. Its totient is φ = 6907986.

The previous prime is 13815937. The next prime is 13816013. The reversal of 13815974 is 47951831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47951831 = 257 ⋅186583.

It is a super-2 number, since 2×13815974² = 381762275137352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3453992 + ... + 3453995.

It is an arithmetic number, because the mean of its divisors is an integer number (5180991).

Almost surely, 2^13815974 is an apocalyptic number.

13815974 is a deficient number, since it is larger than the sum of its proper divisors (6907990).

13815974 is an equidigital number, since it uses as much as digits as its factorization.

13815974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6907989.

The product of its digits is 30240, while the sum is 38.

The square root of 13815974 is about 3716.9845305032. The cubic root of 13815974 is about 239.9535442491.

The spelling of 13815974 in words is "thirteen million, eight hundred fifteen thousand, nine hundred seventy-four".