397977745 has 8 divisors (see below), whose sum is σ = 520989120. Its totient is φ = 289438320.

The previous prime is 397977719. The next prime is 397977761. The reversal of 397977745 is 547779793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397977745 - 2⁷ = 397977617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397977745.

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, 3617925 + ... + 3618034.

It is an arithmetic number, because the mean of its divisors is an integer number (65123640).

Almost surely, 2^397977745 is an apocalyptic number.

It is an amenable number.

397977745 is a deficient number, since it is larger than the sum of its proper divisors (123011375).

397977745 is a wasteful number, since it uses less digits than its factorization.

397977745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7235975.

The product of its digits is 11668860, while the sum is 58.

The square root of 397977745 is about 19949.3795642872. The cubic root of 397977745 is about 735.5625261581.

The spelling of 397977745 in words is "three hundred ninety-seven million, nine hundred seventy-seven thousand, seven hundred forty-five".