13990649 has 4 divisors (see below), whose sum is σ = 14014836. Its totient is φ = 13966464.

The previous prime is 13990637. The next prime is 13990657. The reversal of 13990649 is 94609931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94609931 = 13 ⋅7277687.

It can be written as a sum of positive squares in 2 ways, for example, as 4380649 + 9610000 = 2093^2 + 3100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13990649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13990549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11204 + ... + 12389.

It is an arithmetic number, because the mean of its divisors is an integer number (3503709).

Almost surely, 2^13990649 is an apocalyptic number.

It is an amenable number.

13990649 is a deficient number, since it is larger than the sum of its proper divisors (24187).

13990649 is an equidigital number, since it uses as much as digits as its factorization.

13990649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24186.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 13990649 is about 3740.4075981101. The cubic root of 13990649 is about 240.9605543701.

The spelling of 13990649 in words is "thirteen million, nine hundred ninety thousand, six hundred forty-nine".