399618247 has 8 divisors (see below), whose sum is σ = 458603552. Its totient is φ = 341107200.

The previous prime is 399618229. The next prime is 399618257. The reversal of 399618247 is 742816993.

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

It is not a de Polignac number, because 399618247 - 2⁷ = 399618119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399618247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399618257) 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, 116754 + ... + 120127.

It is an arithmetic number, because the mean of its divisors is an integer number (57325444).

Almost surely, 2^399618247 is an apocalyptic number.

399618247 is a deficient number, since it is larger than the sum of its proper divisors (58985305).

399618247 is a wasteful number, since it uses less digits than its factorization.

399618247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237129.

The product of its digits is 653184, while the sum is 49.

The square root of 399618247 is about 19990.4538967978. The cubic root of 399618247 is about 736.5718267738.

The spelling of 399618247 in words is "three hundred ninety-nine million, six hundred eighteen thousand, two hundred forty-seven".