397821402 has 32 divisors (see below), whose sum is σ = 964416960. Its totient is φ = 120551760.

The previous prime is 397821397. The next prime is 397821421. The reversal of 397821402 is 204128793.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 334273 + ... + 335460.

It is an arithmetic number, because the mean of its divisors is an integer number (30138030).

Almost surely, 2^397821402 is an apocalyptic number.

397821402 is an abundant number, since it is smaller than the sum of its proper divisors (566595558).

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

397821402 is a wasteful number, since it uses less digits than its factorization.

397821402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669755 (or 669749 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 397821402 is about 19945.4606865823. The cubic root of 397821402 is about 735.4661932050.

The spelling of 397821402 in words is "three hundred ninety-seven million, eight hundred twenty-one thousand, four hundred two".