7901999 has 8 divisors (see below), whose sum is σ = 9079200. Its totient is φ = 6736896.

The previous prime is 7901989. The next prime is 7902017. The reversal of 7901999 is 9991097.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7901999 - 2⁴ = 7901983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7901909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1574 + ... + 4275.

It is an arithmetic number, because the mean of its divisors is an integer number (1134900).

Almost surely, 2^7901999 is an apocalyptic number.

7901999 is a deficient number, since it is larger than the sum of its proper divisors (1177201).

7901999 is a wasteful number, since it uses less digits than its factorization.

7901999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 7901999 is about 2811.0494481599. The cubic root of 7901999 is about 199.1799673274.

The spelling of 7901999 in words is "seven million, nine hundred one thousand, nine hundred ninety-nine".