396942639 has 16 divisors (see below), whose sum is σ = 568758528. Its totient is φ = 245342592.

The previous prime is 396942613. The next prime is 396942647. The reversal of 396942639 is 936249693.

It is not a de Polignac number, because 396942639 - 2⁹ = 396942127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 396942591 and 396942600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396942659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54667 + ... + 61500.

It is an arithmetic number, because the mean of its divisors is an integer number (35547408).

Almost surely, 2^396942639 is an apocalyptic number.

396942639 is a deficient number, since it is larger than the sum of its proper divisors (171815889).

396942639 is a wasteful number, since it uses less digits than its factorization.

396942639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116254.

The product of its digits is 1889568, while the sum is 51.

The square root of 396942639 is about 19923.4193601400. The cubic root of 396942639 is about 734.9242607874.

The spelling of 396942639 in words is "three hundred ninety-six million, nine hundred forty-two thousand, six hundred thirty-nine".