397006778 has 16 divisors (see below), whose sum is σ = 680838720. Its totient is φ = 170081856.

The previous prime is 397006759. The next prime is 397006793. The reversal of 397006778 is 877600793.

It is a super-2 number, since 2×397006778² = 315228763555882568, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 70553 + ... + 75971.

It is an arithmetic number, because the mean of its divisors is an integer number (42552420).

Almost surely, 2^397006778 is an apocalyptic number.

397006778 is a deficient number, since it is larger than the sum of its proper divisors (283831942).

397006778 is a wasteful number, since it uses less digits than its factorization.

397006778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 397006778 is about 19925.0289334796. The cubic root of 397006778 is about 734.9638422986.

The spelling of 397006778 in words is "three hundred ninety-seven million, six thousand, seven hundred seventy-eight".