396112991 has 4 divisors (see below), whose sum is σ = 397585800. Its totient is φ = 394640184.

The previous prime is 396112939. The next prime is 396113021. The reversal of 396112991 is 199211693.

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 396112991 - 2²⁶ = 329004127 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 (396112901) 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, 736001 + ... + 736538.

It is an arithmetic number, because the mean of its divisors is an integer number (99396450).

Almost surely, 2^396112991 is an apocalyptic number.

396112991 is a deficient number, since it is larger than the sum of its proper divisors (1472809).

396112991 is a wasteful number, since it uses less digits than its factorization.

396112991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472808.

The product of its digits is 26244, while the sum is 41.

The square root of 396112991 is about 19902.5875453419. The cubic root of 396112991 is about 734.4118830330.

The spelling of 396112991 in words is "three hundred ninety-six million, one hundred twelve thousand, nine hundred ninety-one".