13431887 has 16 divisors (see below), whose sum is σ = 16656192. Its totient is φ = 10567680.

The previous prime is 13431871. The next prime is 13431911. The reversal of 13431887 is 78813431.

It is a cyclic number.

It is not a de Polignac number, because 13431887 - 2⁴ = 13431871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3503 + ... + 6255.

It is an arithmetic number, because the mean of its divisors is an integer number (1041012).

Almost surely, 2^13431887 is an apocalyptic number.

13431887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13431887 is a deficient number, since it is larger than the sum of its proper divisors (3224305).

13431887 is a wasteful number, since it uses less digits than its factorization.

13431887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818.

The product of its digits is 16128, while the sum is 35.

The square root of 13431887 is about 3664.9538878409. The cubic root of 13431887 is about 237.7090281648.

The spelling of 13431887 in words is "thirteen million, four hundred thirty-one thousand, eight hundred eighty-seven".