396581791 has 4 divisors (see below), whose sum is σ = 409374784. Its totient is φ = 383788800.

The previous prime is 396581753. The next prime is 396581849. The reversal of 396581791 is 197185693.

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 396581791 - 2¹³ = 396573599 is a prime.

It is a super-3 number, since 3×396581791³ (a number of 27 digits) contains 333 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 (396581701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6396450 + ... + 6396511.

It is an arithmetic number, because the mean of its divisors is an integer number (102343696).

Almost surely, 2^396581791 is an apocalyptic number.

396581791 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

396581791 is a deficient number, since it is larger than the sum of its proper divisors (12792993).

396581791 is a wasteful number, since it uses less digits than its factorization.

396581791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12792992.

The product of its digits is 408240, while the sum is 49.

The square root of 396581791 is about 19914.3614258655. The cubic root of 396581791 is about 734.7014944692.

The spelling of 396581791 in words is "three hundred ninety-six million, five hundred eighty-one thousand, seven hundred ninety-one".