396373921 has 8 divisors (see below), whose sum is σ = 421255080. Its totient is φ = 371666688.

The previous prime is 396373919. The next prime is 396373949. The reversal of 396373921 is 129373693.

It can be written as a sum of positive squares in 4 ways, for example, as 45373696 + 351000225 = 6736^2 + 18735^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 396373921 - 2¹ = 396373919 is a prime.

It is a super-2 number, since 2×396373921² = 314224570497828482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396373951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38766 + ... + 47911.

It is an arithmetic number, because the mean of its divisors is an integer number (52656885).

Almost surely, 2^396373921 is an apocalyptic number.

It is an amenable number.

396373921 is a deficient number, since it is larger than the sum of its proper divisors (24881159).

396373921 is a wasteful number, since it uses less digits than its factorization.

396373921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86963.

The product of its digits is 183708, while the sum is 43.

The square root of 396373921 is about 19909.1416439785. The cubic root of 396373921 is about 734.5731064172.

The spelling of 396373921 in words is "three hundred ninety-six million, three hundred seventy-three thousand, nine hundred twenty-one".