397766618 has 16 divisors (see below), whose sum is σ = 601499520. Its totient is φ = 197271936.

The previous prime is 397766609. The next prime is 397766647. The reversal of 397766618 is 816667793.

It is a self number, because there is not a number n which added to its sum of digits gives 397766618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233546 + ... + 235242.

It is an arithmetic number, because the mean of its divisors is an integer number (37593720).

Almost surely, 2^397766618 is an apocalyptic number.

397766618 is a deficient number, since it is larger than the sum of its proper divisors (203732902).

397766618 is a wasteful number, since it uses less digits than its factorization.

397766618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581.

The product of its digits is 2286144, while the sum is 53.

The square root of 397766618 is about 19944.0872942333. The cubic root of 397766618 is about 735.4324312963.

The spelling of 397766618 in words is "three hundred ninety-seven million, seven hundred sixty-six thousand, six hundred eighteen".