399682279 has 8 divisors (see below), whose sum is σ = 402735680. Its totient is φ = 396635616.

The previous prime is 399682277. The next prime is 399682307. The reversal of 399682279 is 972286993.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 399682279 - 2¹ = 399682277 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 (399682273) 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, 222517 + ... + 224305.

It is an arithmetic number, because the mean of its divisors is an integer number (50341960).

Almost surely, 2^399682279 is an apocalyptic number.

399682279 is a deficient number, since it is larger than the sum of its proper divisors (3053401).

399682279 is a wasteful number, since it uses less digits than its factorization.

399682279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369.

The product of its digits is 2939328, while the sum is 55.

The square root of 399682279 is about 19992.0553970821. The cubic root of 399682279 is about 736.6111656918.

The spelling of 399682279 in words is "three hundred ninety-nine million, six hundred eighty-two thousand, two hundred seventy-nine".