399320001 has 24 divisors (see below), whose sum is σ = 587174016. Its totient is φ = 261455040.

The previous prime is 399319993. The next prime is 399320003. The reversal of 399320001 is 100023993.

It is not a de Polignac number, because 399320001 - 2³ = 399319993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399320003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171636 + ... + 173946.

It is an arithmetic number, because the mean of its divisors is an integer number (24465584).

Almost surely, 2^399320001 is an apocalyptic number.

It is an amenable number.

399320001 is a deficient number, since it is larger than the sum of its proper divisors (187854015).

399320001 is a wasteful number, since it uses less digits than its factorization.

399320001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653 (or 2650 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 399320001 is about 19982.9927938735. The cubic root of 399320001 is about 736.3885399525.

Adding to 399320001 its reverse (100023993), we get a palindrome (499343994).

It can be divided in two parts, 399 and 320001, that added together give a triangular number (320400 = T₈₀₀).

The spelling of 399320001 in words is "three hundred ninety-nine million, three hundred twenty thousand, one".