396720901 has 4 divisors (see below), whose sum is σ = 399616812. Its totient is φ = 393824992.

The previous prime is 396720889. The next prime is 396720911. The reversal of 396720901 is 109027693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 300190276 + 96530625 = 17326^2 + 9825^2 .

It is a cyclic number.

It is not a de Polignac number, because 396720901 - 2⁷ = 396720773 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 (396720911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447750 + ... + 1448023.

It is an arithmetic number, because the mean of its divisors is an integer number (99904203).

Almost surely, 2^396720901 is an apocalyptic number.

It is an amenable number.

396720901 is a deficient number, since it is larger than the sum of its proper divisors (2895911).

396720901 is a wasteful number, since it uses less digits than its factorization.

396720901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895910.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 396720901 is about 19917.8538251489. The cubic root of 396720901 is about 734.7873887953.

The spelling of 396720901 in words is "three hundred ninety-six million, seven hundred twenty thousand, nine hundred one".