13978764 has 48 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 4591440.

The previous prime is 13978759. The next prime is 13978793. The reversal of 13978764 is 46787931.

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 in 15 ways as a sum of consecutive naturals, for example, 6757 + ... + 8579.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 2^13978764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13978764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18385920).

13978764 is an abundant number, since it is smaller than the sum of its proper divisors (22793076).

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

13978764 is a wasteful number, since it uses less digits than its factorization.

13978764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907 (or 1899 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 13978764 is about 3738.8185299637. The cubic root of 13978764 is about 240.8923033665.

The spelling of 13978764 in words is "thirteen million, nine hundred seventy-eight thousand, seven hundred sixty-four".