13387431 has 8 divisors (see below), whose sum is σ = 17867520. Its totient is φ = 8916152.

The previous prime is 13387427. The next prime is 13387447. The reversal of 13387431 is 13478331.

13387431 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13387431 - 2² = 13387427 is a prime.

It is a super-2 number, since 2×13387431² = 358446617559522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13387411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3340 + ... + 6158.

It is an arithmetic number, because the mean of its divisors is an integer number (2233440).

Almost surely, 2^13387431 is an apocalyptic number.

13387431 is a deficient number, since it is larger than the sum of its proper divisors (4480089).

13387431 is a wasteful number, since it uses less digits than its factorization.

13387431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405.

The product of its digits is 6048, while the sum is 30.

The square root of 13387431 is about 3658.8838462023. The cubic root of 13387431 is about 237.4464869277.

The spelling of 13387431 in words is "thirteen million, three hundred eighty-seven thousand, four hundred thirty-one".