396720880 has 40 divisors (see below), whose sum is σ = 926280000. Its totient is φ = 158016768.

The previous prime is 396720853. The next prime is 396720887. The reversal of 396720880 is 88027693.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396720887) 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 7 ways as a sum of consecutive naturals, for example, 8746 + ... + 29494.

It is an arithmetic number, because the mean of its divisors is an integer number (23157000).

Almost surely, 2^396720880 is an apocalyptic number.

It is an amenable number.

396720880 is an abundant number, since it is smaller than the sum of its proper divisors (529559120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396720880 is a wasteful number, since it uses less digits than its factorization.

396720880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21001 (or 20995 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 396720880 is about 19917.8532979837. The cubic root of 396720880 is about 734.7873758302.

The spelling of 396720880 in words is "three hundred ninety-six million, seven hundred twenty thousand, eight hundred eighty".