397547777 has 8 divisors (see below), whose sum is σ = 434203680. Its totient is φ = 360977760.

The previous prime is 397547749. The next prime is 397547803. The reversal of 397547777 is 777745793.

It is a happy number.

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

It is not a de Polignac number, because 397547777 - 2⁶ = 397547713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397547177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11588 + ... + 30485.

It is an arithmetic number, because the mean of its divisors is an integer number (54275460).

Almost surely, 2^397547777 is an apocalyptic number.

It is an amenable number.

397547777 is a deficient number, since it is larger than the sum of its proper divisors (36655903).

397547777 is a wasteful number, since it uses less digits than its factorization.

397547777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42943.

The product of its digits is 9075780, while the sum is 56.

The square root of 397547777 is about 19938.6001765420. The cubic root of 397547777 is about 735.2975345286.

The spelling of 397547777 in words is "three hundred ninety-seven million, five hundred forty-seven thousand, seven hundred seventy-seven".