399479977 has 8 divisors (see below), whose sum is σ = 430869320. Its totient is φ = 368184960.

The previous prime is 399479953. The next prime is 399479999. The reversal of 399479977 is 779974993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36348841 + 363131136 = 6029^2 + 19056^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-399479977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399479917) 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 7 ways as a sum of consecutive naturals, for example, 14652 + ... + 31837.

It is an arithmetic number, because the mean of its divisors is an integer number (53858665).

Almost surely, 2^399479977 is an apocalyptic number.

It is an amenable number.

399479977 is a deficient number, since it is larger than the sum of its proper divisors (31389343).

399479977 is a wasteful number, since it uses less digits than its factorization.

399479977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47163.

The product of its digits is 27005076, while the sum is 64.

The square root of 399479977 is about 19986.9951968774. The cubic root of 399479977 is about 736.4868644080.

The spelling of 399479977 in words is "three hundred ninety-nine million, four hundred seventy-nine thousand, nine hundred seventy-seven".