399627817 has 8 divisors (see below), whose sum is σ = 421534400. Its totient is φ = 377808624.

The previous prime is 399627799. The next prime is 399627821. The reversal of 399627817 is 718726993.

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 399627817 - 2¹¹ = 399625769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399627017) 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, 12342 + ... + 30847.

It is an arithmetic number, because the mean of its divisors is an integer number (52691800).

Almost surely, 2^399627817 is an apocalyptic number.

It is an amenable number.

399627817 is a deficient number, since it is larger than the sum of its proper divisors (21906583).

399627817 is a wasteful number, since it uses less digits than its factorization.

399627817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43695.

The product of its digits is 1143072, while the sum is 52.

The square root of 399627817 is about 19990.6932596146. The cubic root of 399627817 is about 736.5777064988.

It can be divided in two parts, 3996 and 27817, that added together give a palindrome (31813).

The spelling of 399627817 in words is "three hundred ninety-nine million, six hundred twenty-seven thousand, eight hundred seventeen".