397222777 has 16 divisors (see below), whose sum is σ = 471094272. Its totient is φ = 327857040.

The previous prime is 397222769. The next prime is 397222807. The reversal of 397222777 is 777222793.

It is not a de Polignac number, because 397222777 - 2³ = 397222769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397222277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12078 + ... + 30664.

It is an arithmetic number, because the mean of its divisors is an integer number (29443392).

Almost surely, 2^397222777 is an apocalyptic number.

It is an amenable number.

397222777 is a deficient number, since it is larger than the sum of its proper divisors (73871495).

397222777 is a wasteful number, since it uses less digits than its factorization.

397222777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18708.

The product of its digits is 518616, while the sum is 46.

The square root of 397222777 is about 19930.4484896853. The cubic root of 397222777 is about 735.0971084306.

The spelling of 397222777 in words is "three hundred ninety-seven million, two hundred twenty-two thousand, seven hundred seventy-seven".