399031001 has 4 divisors (see below), whose sum is σ = 399251712. Its totient is φ = 398810292.

The previous prime is 399030949. The next prime is 399031007. The reversal of 399031001 is 100130993.

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 a de Polignac number, because none of the positive numbers 2^k-399031001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399031007) 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, 107621 + ... + 111266.

It is an arithmetic number, because the mean of its divisors is an integer number (99812928).

Almost surely, 2^399031001 is an apocalyptic number.

It is an amenable number.

399031001 is a deficient number, since it is larger than the sum of its proper divisors (220711).

399031001 is a wasteful number, since it uses less digits than its factorization.

399031001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220710.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 399031001 is about 19975.7603359672. The cubic root of 399031001 is about 736.2108481693.

Adding to 399031001 its reverse (100130993), we get a palindrome (499161994).

It can be divided in two parts, 39903 and 1001, that added together give a palindrome (40904).

The spelling of 399031001 in words is "three hundred ninety-nine million, thirty-one thousand, one".