399894143 has 4 divisors (see below), whose sum is σ = 436248168. Its totient is φ = 363540120.

The previous prime is 399894133. The next prime is 399894151. The reversal of 399894143 is 341498993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399894143 - 2⁸ = 399893887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399894091 and 399894100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399894133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18176996 + ... + 18177017.

It is an arithmetic number, because the mean of its divisors is an integer number (109062042).

Almost surely, 2^399894143 is an apocalyptic number.

399894143 is a deficient number, since it is larger than the sum of its proper divisors (36354025).

399894143 is a wasteful number, since it uses less digits than its factorization.

399894143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36354024.

The product of its digits is 839808, while the sum is 50.

The square root of 399894143 is about 19997.3533998877. The cubic root of 399894143 is about 736.7412972399.

The spelling of 399894143 in words is "three hundred ninety-nine million, eight hundred ninety-four thousand, one hundred forty-three".