397516878 has 24 divisors (see below), whose sum is σ = 939585816. Its totient is φ = 120459600.

The previous prime is 397516837. The next prime is 397516919. The reversal of 397516878 is 878615793.

It is an interprime number because it is at equal distance from previous prime (397516837) and next prime (397516919).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1003633 + ... + 1004028.

It is an arithmetic number, because the mean of its divisors is an integer number (39149409).

Almost surely, 2^397516878 is an apocalyptic number.

397516878 is an abundant number, since it is smaller than the sum of its proper divisors (542068938).

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

397516878 is a wasteful number, since it uses less digits than its factorization.

397516878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007680 (or 2007677 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 397516878 is about 19937.8253076909. The cubic root of 397516878 is about 735.2784839486.

The spelling of 397516878 in words is "three hundred ninety-seven million, five hundred sixteen thousand, eight hundred seventy-eight".