399204401 has 4 divisors (see below), whose sum is σ = 412970100. Its totient is φ = 385438704.

The previous prime is 399204397. The next prime is 399204457. The reversal of 399204401 is 104402993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104402993 = 101 ⋅1033693.

It can be written as a sum of positive squares in 2 ways, for example, as 293608225 + 105596176 = 17135^2 + 10276^2 .

It is a cyclic number.

It is not a de Polignac number, because 399204401 - 2² = 399204397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399204461) 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, 6882806 + ... + 6882863.

It is an arithmetic number, because the mean of its divisors is an integer number (103242525).

Almost surely, 2^399204401 is an apocalyptic number.

It is an amenable number.

399204401 is a deficient number, since it is larger than the sum of its proper divisors (13765699).

399204401 is a wasteful number, since it uses less digits than its factorization.

399204401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765698.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 399204401 is about 19980.1001248742. The cubic root of 399204401 is about 736.3174735306.

The spelling of 399204401 in words is "three hundred ninety-nine million, two hundred four thousand, four hundred one".