397907686 has 16 divisors (see below), whose sum is σ = 651427920. Its totient is φ = 180782080.

The previous prime is 397907683. The next prime is 397907689. The reversal of 397907686 is 686709793.

It is an interprime number because it is at equal distance from previous prime (397907683) and next prime (397907689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397907683) by changing a digit.

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, 90630 + ... + 94918.

It is an arithmetic number, because the mean of its divisors is an integer number (40714245).

Almost surely, 2^397907686 is an apocalyptic number.

397907686 is a deficient number, since it is larger than the sum of its proper divisors (253520234).

397907686 is a wasteful number, since it uses less digits than its factorization.

397907686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8519.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The square root of 397907686 is about 19947.6235677336. The cubic root of 397907686 is about 735.5193614336.

The spelling of 397907686 in words is "three hundred ninety-seven million, nine hundred seven thousand, six hundred eighty-six".