399975001 has 4 divisors (see below), whose sum is σ = 400040100. Its totient is φ = 399909904.

The previous prime is 399974999. The next prime is 399975013. The reversal of 399975001 is 100579993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104960025 + 295014976 = 10245^2 + 17176^2 .

It is a cyclic number.

It is not a de Polignac number, because 399975001 - 2¹ = 399974999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399979001) 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, 22246 + ... + 35983.

It is an arithmetic number, because the mean of its divisors is an integer number (100010025).

Almost surely, 2^399975001 is an apocalyptic number.

It is an amenable number.

399975001 is a deficient number, since it is larger than the sum of its proper divisors (65099).

399975001 is an equidigital number, since it uses as much as digits as its factorization.

399975001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65098.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 399975001 is about 19999.3750152349. The cubic root of 399975001 is about 736.7909498911.

The spelling of 399975001 in words is "three hundred ninety-nine million, nine hundred seventy-five thousand, one".