3999870401 has 4 divisors (see below), whose sum is σ = 4003990704. Its totient is φ = 3995750100.

The previous prime is 3999870397. The next prime is 3999870419. The reversal of 3999870401 is 1040789993.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1040789993 = 67 ⋅15534179.

It is a cyclic number.

It is not a de Polignac number, because 3999870401 - 2² = 3999870397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3999870401.

It is not an unprimeable number, because it can be changed into a prime (3999870451) 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, 2058695 + ... + 2060636.

It is an arithmetic number, because the mean of its divisors is an integer number (1000997676).

Almost surely, 2^3999870401 is an apocalyptic number.

It is an amenable number.

3999870401 is a deficient number, since it is larger than the sum of its proper divisors (4120303).

3999870401 is an equidigital number, since it uses as much as digits as its factorization.

3999870401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120302.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 3999870401 is about 63244.5286250123. The cubic root of 3999870401 is about 1587.3839079840.

The spelling of 3999870401 in words is "three billion, nine hundred ninety-nine million, eight hundred seventy thousand, four hundred one".