397749677 has 4 divisors (see below), whose sum is σ = 428345820. Its totient is φ = 367153536.

The previous prime is 397749661. The next prime is 397749679. The reversal of 397749677 is 776947793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 776947793 = 37 ⋅20998589.

It can be written as a sum of positive squares in 2 ways, for example, as 260531881 + 137217796 = 16141^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 397749677 - 2⁴ = 397749661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397749679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15298052 + ... + 15298077.

It is an arithmetic number, because the mean of its divisors is an integer number (107086455).

Almost surely, 2^397749677 is an apocalyptic number.

It is an amenable number.

397749677 is a deficient number, since it is larger than the sum of its proper divisors (30596143).

397749677 is a wasteful number, since it uses less digits than its factorization.

397749677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30596142.

The product of its digits is 14002632, while the sum is 59.

The square root of 397749677 is about 19943.6625773703. The cubic root of 397749677 is about 735.4219903852.

The spelling of 397749677 in words is "three hundred ninety-seven million, seven hundred forty-nine thousand, six hundred seventy-seven".