13987479 has 32 divisors (see below), whose sum is σ = 21362688. Its totient is φ = 8131200.

The previous prime is 13987459. The next prime is 13987487. The reversal of 13987479 is 97478931.

13987479 = 7² + 8² + ... + 347².

It is not a de Polignac number, because 13987479 - 2¹¹ = 13985431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13987459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123727 + ... + 123839.

It is an arithmetic number, because the mean of its divisors is an integer number (667584).

Almost surely, 2^13987479 is an apocalyptic number.

13987479 is a deficient number, since it is larger than the sum of its proper divisors (7375209).

13987479 is a wasteful number, since it uses less digits than its factorization.

13987479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 158 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 13987479 is about 3739.9838234944. The cubic root of 13987479 is about 240.9423540551.

The spelling of 13987479 in words is "thirteen million, nine hundred eighty-seven thousand, four hundred seventy-nine".