399432841 has 4 divisors (see below), whose sum is σ = 399538384. Its totient is φ = 399327300.

The previous prime is 399432829. The next prime is 399432851. The reversal of 399432841 is 148234993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399432841 - 2¹⁷ = 399301769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399432811) 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, 46875 + ... + 54736.

It is an arithmetic number, because the mean of its divisors is an integer number (99884596).

Almost surely, 2^399432841 is an apocalyptic number.

It is an amenable number.

399432841 is a deficient number, since it is larger than the sum of its proper divisors (105543).

399432841 is a wasteful number, since it uses less digits than its factorization.

399432841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105542.

The product of its digits is 186624, while the sum is 43.

The square root of 399432841 is about 19985.8159953503. The cubic root of 399432841 is about 736.4578964060.

The spelling of 399432841 in words is "three hundred ninety-nine million, four hundred thirty-two thousand, eight hundred forty-one".