13427991 has 32 divisors (see below), whose sum is σ = 20951040. Its totient is φ = 8488800.

The previous prime is 13427983. The next prime is 13428049. The reversal of 13427991 is 19972431.

It is not a de Polignac number, because 13427991 - 2³ = 13427983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13427971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50926 + ... + 51188.

It is an arithmetic number, because the mean of its divisors is an integer number (654720).

Almost surely, 2^13427991 is an apocalyptic number.

13427991 is a deficient number, since it is larger than the sum of its proper divisors (7523049).

13427991 is a wasteful number, since it uses less digits than its factorization.

13427991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 358 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 13427991 is about 3664.4223282804. The cubic root of 13427991 is about 237.6860429623.

The spelling of 13427991 in words is "thirteen million, four hundred twenty-seven thousand, nine hundred ninety-one".