397428878 has 16 divisors (see below), whose sum is σ = 743243904. Its totient is φ = 154842360.

The previous prime is 397428853. The next prime is 397428893. The reversal of 397428878 is 878824793.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1290200 + ... + 1290507.

It is an arithmetic number, because the mean of its divisors is an integer number (46452744).

Almost surely, 2^397428878 is an apocalyptic number.

397428878 is a deficient number, since it is larger than the sum of its proper divisors (345815026).

397428878 is a wasteful number, since it uses less digits than its factorization.

397428878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580727.

The product of its digits is 5419008, while the sum is 56.

The square root of 397428878 is about 19935.6183249981. The cubic root of 397428878 is about 735.2242227038.

The spelling of 397428878 in words is "three hundred ninety-seven million, four hundred twenty-eight thousand, eight hundred seventy-eight".