396623181 has 4 divisors (see below), whose sum is σ = 528830912. Its totient is φ = 264415452.

The previous prime is 396623179. The next prime is 396623189. The reversal of 396623181 is 181326693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 396623181 - 2¹ = 396623179 is a prime.

It is a super-2 number, since 2×396623181² = 314619895413117522, 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 (396623189) 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, 66103861 + ... + 66103866.

It is an arithmetic number, because the mean of its divisors is an integer number (132207728).

Almost surely, 2^396623181 is an apocalyptic number.

It is an amenable number.

396623181 is a deficient number, since it is larger than the sum of its proper divisors (132207731).

396623181 is a wasteful number, since it uses less digits than its factorization.

396623181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132207730.

The product of its digits is 46656, while the sum is 39.

The square root of 396623181 is about 19915.4005985318. The cubic root of 396623181 is about 734.7270530784.

The spelling of 396623181 in words is "three hundred ninety-six million, six hundred twenty-three thousand, one hundred eighty-one".