396599991 has 4 divisors (see below), whose sum is σ = 528799992. Its totient is φ = 264399992.

The previous prime is 396599989. The next prime is 396599999. The reversal of 396599991 is 199995693.

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

It is a cyclic number.

It is not a de Polignac number, because 396599991 - 2¹ = 396599989 is a prime.

It is a super-2 number, since 2×396599991² = 314583105722400162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396599999) 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 3 ways as a sum of consecutive naturals, for example, 66099996 + ... + 66100001.

It is an arithmetic number, because the mean of its divisors is an integer number (132199998).

Almost surely, 2^396599991 is an apocalyptic number.

396599991 is a deficient number, since it is larger than the sum of its proper divisors (132200001).

396599991 is a wasteful number, since it uses less digits than its factorization.

396599991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132200000.

The product of its digits is 5314410, while the sum is 60.

The square root of 396599991 is about 19914.8183772788. The cubic root of 396599991 is about 734.7127333132.

The spelling of 396599991 in words is "three hundred ninety-six million, five hundred ninety-nine thousand, nine hundred ninety-one".