399682278 has 12 divisors (see below), whose sum is σ = 865978308. Its totient is φ = 133227420.

The previous prime is 399682277. The next prime is 399682307. The reversal of 399682278 is 872286993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399682273) 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 5 ways as a sum of consecutive naturals, for example, 11102268 + ... + 11102303.

It is an arithmetic number, because the mean of its divisors is an integer number (72164859).

Almost surely, 2^399682278 is an apocalyptic number.

399682278 is an abundant number, since it is smaller than the sum of its proper divisors (466296030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399682278 is a wasteful number, since it uses less digits than its factorization.

399682278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22204579 (or 22204576 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 399682278 is about 19992.0553720722. The cubic root of 399682278 is about 736.6111650775.

The spelling of 399682278 in words is "three hundred ninety-nine million, six hundred eighty-two thousand, two hundred seventy-eight".