397977049618 has 24 divisors (see below), whose sum is σ = 606420587520. Its totient is φ = 195847129800.

The previous prime is 397977049601. The next prime is 397977049643. The reversal of 397977049618 is 816940779793.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 56535343 + ... + 56542381.

It is an arithmetic number, because the mean of its divisors is an integer number (25267524480).

Almost surely, 2^397977049618 is an apocalyptic number.

397977049618 is a deficient number, since it is larger than the sum of its proper divisors (208443537902).

397977049618 is an frugal number, since it uses more digits than its factorization.

397977049618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8374 (or 7743 counting only the distinct ones).

The product of its (nonzero) digits is 144027072, while the sum is 70.

The spelling of 397977049618 in words is "three hundred ninety-seven billion, nine hundred seventy-seven million, forty-nine thousand, six hundred eighteen".