397977747 has 16 divisors (see below), whose sum is σ = 539735040. Its totient is φ = 260799552.

The previous prime is 397977719. The next prime is 397977761. The reversal of 397977747 is 747779793.

It is not a de Polignac number, because 397977747 - 2¹² = 397973651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397977787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51618 + ... + 58824.

It is an arithmetic number, because the mean of its divisors is an integer number (33733440).

Almost surely, 2^397977747 is an apocalyptic number.

397977747 is a deficient number, since it is larger than the sum of its proper divisors (141757293).

397977747 is a wasteful number, since it uses less digits than its factorization.

397977747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7522.

The product of its digits is 16336404, while the sum is 60.

The square root of 397977747 is about 19949.3796144141. The cubic root of 397977747 is about 735.5625273903.

The spelling of 397977747 in words is "three hundred ninety-seven million, nine hundred seventy-seven thousand, seven hundred forty-seven".