399128001 has 12 divisors (see below), whose sum is σ = 542412528. Its totient is φ = 261059344.

The previous prime is 399127999. The next prime is 399128027. The reversal of 399128001 is 100821993.

It is not a de Polignac number, because 399128001 - 2¹ = 399127999 is a prime.

It is a super-2 number, since 2×399128001² = 318606322364512002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399123001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15255 + ... + 32108.

It is an arithmetic number, because the mean of its divisors is an integer number (45201044).

Almost surely, 2^399128001 is an apocalyptic number.

It is an amenable number.

399128001 is a deficient number, since it is larger than the sum of its proper divisors (143284527).

399128001 is an equidigital number, since it uses as much as digits as its factorization.

399128001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47472 (or 47419 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 399128001 is about 19978.1881310593. The cubic root of 399128001 is about 736.2704982268.

Adding to 399128001 its reverse (100821993), we get a palindrome (499949994).

The spelling of 399128001 in words is "three hundred ninety-nine million, one hundred twenty-eight thousand, one".