13621401 has 6 divisors (see below), whose sum is σ = 19675370. Its totient is φ = 9080928.

The previous prime is 13621381. The next prime is 13621409. The reversal of 13621401 is 10412631.

It is a happy number.

13621401 is a `hidden beast` number, since 1 + 3 + 621 + 40 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13329801 + 291600 = 3651^2 + 540^2 .

It is not a de Polignac number, because 13621401 - 2⁹ = 13620889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13621409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 756736 + ... + 756753.

Almost surely, 2^13621401 is an apocalyptic number.

It is an amenable number.

13621401 is a deficient number, since it is larger than the sum of its proper divisors (6053969).

13621401 is a wasteful number, since it uses less digits than its factorization.

13621401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513495 (or 1513492 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 13621401 is about 3690.7182227854. The cubic root of 13621401 is about 238.8217773461.

The spelling of 13621401 in words is "thirteen million, six hundred twenty-one thousand, four hundred one".