7899144 has 32 divisors (see below), whose sum is σ = 21543840. Its totient is φ = 2393600.

The previous prime is 7899137. The next prime is 7899161. The reversal of 7899144 is 4419987.

It is a junction number, because it is equal to n+sod(n) for n = 7899096 and 7899105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14697 + ... + 15224.

It is an arithmetic number, because the mean of its divisors is an integer number (673245).

Almost surely, 2^7899144 is an apocalyptic number.

It is an amenable number.

7899144 is an abundant number, since it is smaller than the sum of its proper divisors (13644696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7899144 is a wasteful number, since it uses less digits than its factorization.

7899144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29941 (or 29937 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 7899144 is about 2810.5415848196. The cubic root of 7899144 is about 199.1559764652.

The spelling of 7899144 in words is "seven million, eight hundred ninety-nine thousand, one hundred forty-four".