397802887 has 2 divisors, whose sum is σ = 397802888. Its totient is φ = 397802886.

The previous prime is 397802863. The next prime is 397802891. The reversal of 397802887 is 788208793.

It is a strong prime.

It is an emirp because it is prime and its reverse (788208793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397802887 - 2⁷ = 397802759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397802837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198901443 + 198901444.

It is an arithmetic number, because the mean of its divisors is an integer number (198901444).

Almost surely, 2^397802887 is an apocalyptic number.

397802887 is a deficient number, since it is larger than the sum of its proper divisors (1).

397802887 is an equidigital number, since it uses as much as digits as its factorization.

397802887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The square root of 397802887 is about 19944.9965404860. The cubic root of 397802887 is about 735.4547832543.

The spelling of 397802887 in words is "three hundred ninety-seven million, eight hundred two thousand, eight hundred eighty-seven".