399409671 has 8 divisors (see below), whose sum is σ = 544931200. Its totient is φ = 260080632.

The previous prime is 399409669. The next prime is 399409693. The reversal of 399409671 is 176904993.

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

It is not a de Polignac number, because 399409671 - 2¹ = 399409669 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 399409671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399409601) 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, 1547971 + ... + 1548228.

It is an arithmetic number, because the mean of its divisors is an integer number (68116400).

Almost surely, 2^399409671 is an apocalyptic number.

399409671 is a deficient number, since it is larger than the sum of its proper divisors (145521529).

399409671 is a wasteful number, since it uses less digits than its factorization.

399409671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096245.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 399409671 is about 19985.2363258481. The cubic root of 399409671 is about 736.4436561653.

The spelling of 399409671 in words is "three hundred ninety-nine million, four hundred nine thousand, six hundred seventy-one".