13487989 has 4 divisors (see below), whose sum is σ = 13525920. Its totient is φ = 13450060.

The previous prime is 13487983. The next prime is 13487993. The reversal of 13487989 is 98978431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13487989 - 2¹⁹ = 12963701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13487983) 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, 18427 + ... + 19144.

It is an arithmetic number, because the mean of its divisors is an integer number (3381480).

Almost surely, 2^13487989 is an apocalyptic number.

It is an amenable number.

13487989 is a deficient number, since it is larger than the sum of its proper divisors (37931).

13487989 is an equidigital number, since it uses as much as digits as its factorization.

13487989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37930.

The product of its digits is 435456, while the sum is 49.

The square root of 13487989 is about 3672.5997603877. The cubic root of 13487989 is about 238.0395210127.

The spelling of 13487989 in words is "thirteen million, four hundred eighty-seven thousand, nine hundred eighty-nine".