13402991 has 8 divisors (see below), whose sum is σ = 15732000. Its totient is φ = 11177568.

The previous prime is 13402979. The next prime is 13402993. The reversal of 13402991 is 19920431.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13402991 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 (13402993) 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 7 ways as a sum of consecutive naturals, for example, 25616 + ... + 26133.

It is an arithmetic number, because the mean of its divisors is an integer number (1966500).

Almost surely, 2^13402991 is an apocalyptic number.

13402991 is a deficient number, since it is larger than the sum of its proper divisors (2329009).

13402991 is an equidigital number, since it uses as much as digits as its factorization.

13402991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51793.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 13402991 is about 3661.0095602170. The cubic root of 13402991 is about 237.5384447460.

The spelling of 13402991 in words is "thirteen million, four hundred two thousand, nine hundred ninety-one".