13431387 has 8 divisors (see below), whose sum is σ = 17948736. Its totient is φ = 8934152.

The previous prime is 13431373. The next prime is 13431391. The reversal of 13431387 is 78313431.

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 13431387 - 2⁴ = 13431371 is a prime.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (13431787) 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, 3393 + ... + 6194.

It is an arithmetic number, because the mean of its divisors is an integer number (2243592).

Almost surely, 2^13431387 is an apocalyptic number.

13431387 is a deficient number, since it is larger than the sum of its proper divisors (4517349).

13431387 is an equidigital number, since it uses as much as digits as its factorization.

13431387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057.

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

The square root of 13431387 is about 3664.8856735238. The cubic root of 13431387 is about 237.7060785671.

The spelling of 13431387 in words is "thirteen million, four hundred thirty-one thousand, three hundred eighty-seven".