396717820 has 24 divisors (see below), whose sum is σ = 835799328. Its totient is φ = 158174400.

The previous prime is 396717803. The next prime is 396717821. The reversal of 396717820 is 28717693.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396717821) 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 7 ways as a sum of consecutive naturals, for example, 25671 + ... + 38110.

It is an arithmetic number, because the mean of its divisors is an integer number (34824972).

Almost surely, 2^396717820 is an apocalyptic number.

It is an amenable number.

396717820 is an abundant number, since it is smaller than the sum of its proper divisors (439081508).

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

396717820 is a wasteful number, since it uses less digits than its factorization.

396717820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64101 (or 64099 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 396717820 is about 19917.7764823285. The cubic root of 396717820 is about 734.7854866303.

The spelling of 396717820 in words is "three hundred ninety-six million, seven hundred seventeen thousand, eight hundred twenty".