397786436 has 6 divisors (see below), whose sum is σ = 696126270. Its totient is φ = 198893216.

The previous prime is 397786373. The next prime is 397786463. The reversal of 397786436 is 634687793.

It can be written as a sum of positive squares in only one way, i.e., 396248836 + 1537600 = 19906^2 + 1240^2 .

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 as a sum of consecutive naturals, namely, 49723301 + ... + 49723308.

It is an arithmetic number, because the mean of its divisors is an integer number (116021045).

Almost surely, 2^397786436 is an apocalyptic number.

It is an amenable number.

397786436 is a deficient number, since it is larger than the sum of its proper divisors (298339834).

397786436 is a wasteful number, since it uses less digits than its factorization.

397786436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99446613 (or 99446611 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 53.

The square root of 397786436 is about 19944.5841270256. The cubic root of 397786436 is about 735.4446449556. Note that the first 3 decimals are identical.

The spelling of 397786436 in words is "three hundred ninety-seven million, seven hundred eighty-six thousand, four hundred thirty-six".