13991401 has 2 divisors, whose sum is σ = 13991402. Its totient is φ = 13991400.

The previous prime is 13991389. The next prime is 13991441. The reversal of 13991401 is 10419931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13690000 + 301401 = 3700^2 + 549^2 .

It is a cyclic number.

It is not a de Polignac number, because 13991401 - 2⁷ = 13991273 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13991401.

It is not a weakly prime, because it can be changed into another prime (13991441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995700 + 6995701.

It is an arithmetic number, because the mean of its divisors is an integer number (6995701).

Almost surely, 2^13991401 is an apocalyptic number.

It is an amenable number.

13991401 is a deficient number, since it is larger than the sum of its proper divisors (1).

13991401 is an equidigital number, since it uses as much as digits as its factorization.

13991401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 13991401 is about 3740.5081205633. The cubic root of 13991401 is about 240.9648715177.

The spelling of 13991401 in words is "thirteen million, nine hundred ninety-one thousand, four hundred one".