396373991 has 8 divisors (see below), whose sum is σ = 449331120. Its totient is φ = 346626432.

The previous prime is 396373987. The next prime is 396373997. The reversal of 396373991 is 199373693.

It is a happy number.

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 396373991 - 2² = 396373987 is a prime.

It is a super-2 number, since 2×396373991² = 314224681482536162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396373997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802130 + ... + 802623.

It is an arithmetic number, because the mean of its divisors is an integer number (56166390).

Almost surely, 2^396373991 is an apocalyptic number.

396373991 is a deficient number, since it is larger than the sum of its proper divisors (52957129).

396373991 is a wasteful number, since it uses less digits than its factorization.

396373991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604785.

The product of its digits is 826686, while the sum is 50.

The square root of 396373991 is about 19909.1434019648. The cubic root of 396373991 is about 734.5731496593.

The spelling of 396373991 in words is "three hundred ninety-six million, three hundred seventy-three thousand, nine hundred ninety-one".