13487621 has 4 divisors (see below), whose sum is σ = 15414432. Its totient is φ = 11560812.

The previous prime is 13487611. The next prime is 13487627. The reversal of 13487621 is 12678431.

13487621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13487621 - 2⁶ = 13487557 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 (13487627) 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, 963395 + ... + 963408.

It is an arithmetic number, because the mean of its divisors is an integer number (3853608).

Almost surely, 2^13487621 is an apocalyptic number.

It is an amenable number.

13487621 is a deficient number, since it is larger than the sum of its proper divisors (1926811).

13487621 is an equidigital number, since it uses as much as digits as its factorization.

13487621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926810.

The product of its digits is 8064, while the sum is 32.

The square root of 13487621 is about 3672.5496592967. The cubic root of 13487621 is about 238.0373561400.

The spelling of 13487621 in words is "thirteen million, four hundred eighty-seven thousand, six hundred twenty-one".