396381988 has 12 divisors (see below), whose sum is σ = 700033180. Its totient is φ = 196372512.

The previous prime is 396381967. The next prime is 396382031. The reversal of 396381988 is 889183693.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 288388324 + 107993664 = 16982^2 + 10392^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454131 + ... + 455002.

Almost surely, 2^396381988 is an apocalyptic number.

It is an amenable number.

396381988 is a deficient number, since it is larger than the sum of its proper divisors (303651192).

396381988 is a wasteful number, since it uses less digits than its factorization.

396381988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909246 (or 909244 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 396381988 is about 19909.3442383219. The cubic root of 396381988 is about 734.5780897261.

The spelling of 396381988 in words is "three hundred ninety-six million, three hundred eighty-one thousand, nine hundred eighty-eight".