1396053621 has 6 divisors (see below), whose sum is σ = 2016521910. Its totient is φ = 930702408.

The previous prime is 1396053601. The next prime is 1396053653. The reversal of 1396053621 is 1263506931.

1396053621 is a `hidden beast` number, since 13 + 9 + 605 + 36 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 893172996 + 502880625 = 29886^2 + 22425^2 .

It is not a de Polignac number, because 1396053621 - 2²⁵ = 1362499189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396053601) 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, 77558526 + ... + 77558543.

It is an arithmetic number, because the mean of its divisors is an integer number (336086985).

Almost surely, 2^1396053621 is an apocalyptic number.

It is an amenable number.

1396053621 is a deficient number, since it is larger than the sum of its proper divisors (620468289).

1396053621 is a wasteful number, since it uses less digits than its factorization.

1396053621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155117075 (or 155117072 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 1396053621 is about 37363.8009442294. The cubic root of 1396053621 is about 1117.6368170249.

The spelling of 1396053621 in words is "one billion, three hundred ninety-six million, fifty-three thousand, six hundred twenty-one".