13988407 has 4 divisors (see below), whose sum is σ = 14038120. Its totient is φ = 13938696.

The previous prime is 13988341. The next prime is 13988413. The reversal of 13988407 is 70488931.

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

It is a cyclic number.

It is not a de Polignac number, because 13988407 - 2⁷ = 13988279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13988407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13988417) 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, 24432 + ... + 24997.

It is an arithmetic number, because the mean of its divisors is an integer number (3509530).

Almost surely, 2^13988407 is an apocalyptic number.

13988407 is a deficient number, since it is larger than the sum of its proper divisors (49713).

13988407 is an equidigital number, since it uses as much as digits as its factorization.

13988407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49712.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 13988407 is about 3740.1078861445. The cubic root of 13988407 is about 240.9476823815.

The spelling of 13988407 in words is "thirteen million, nine hundred eighty-eight thousand, four hundred seven".