399142043 has 4 divisors (see below), whose sum is σ = 399335928. Its totient is φ = 398948160.

The previous prime is 399142033. The next prime is 399142067. The reversal of 399142043 is 340241993.

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 399142043 - 2⁶ = 399141979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399141994 and 399142012.

It is not an unprimeable number, because it can be changed into a prime (399142033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93821 + ... + 97982.

It is an arithmetic number, because the mean of its divisors is an integer number (99833982).

Almost surely, 2^399142043 is an apocalyptic number.

399142043 is a deficient number, since it is larger than the sum of its proper divisors (193885).

399142043 is a wasteful number, since it uses less digits than its factorization.

399142043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193884.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 399142043 is about 19978.5395612392. The cubic root of 399142043 is about 736.2791325405.

The spelling of 399142043 in words is "three hundred ninety-nine million, one hundred forty-two thousand, forty-three".