13979890 has 8 divisors (see below), whose sum is σ = 25163820. Its totient is φ = 5591952.

The previous prime is 13979857. The next prime is 13979921. The reversal of 13979890 is 9897931.

13979890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13623481 + 356409 = 3691^2 + 597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13979890.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698985 + ... + 699004.

Almost surely, 2^13979890 is an apocalyptic number.

13979890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13979890 is a deficient number, since it is larger than the sum of its proper divisors (11183930).

13979890 is a wasteful number, since it uses less digits than its factorization.

13979890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397996.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 13979890 is about 3738.9691092599. The cubic root of 13979890 is about 240.8987712118.

The spelling of 13979890 in words is "thirteen million, nine hundred seventy-nine thousand, eight hundred ninety".