7940999 has 4 divisors (see below), whose sum is σ = 8662920. Its totient is φ = 7219080.

The previous prime is 7940981. The next prime is 7941007. The reversal of 7940999 is 9990497.

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

It is a de Polignac number, because none of the positive numbers 2^k-7940999 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 (7940399) 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 3 ways as a sum of consecutive naturals, for example, 360944 + ... + 360965.

It is an arithmetic number, because the mean of its divisors is an integer number (2165730).

Almost surely, 2^7940999 is an apocalyptic number.

7940999 is a deficient number, since it is larger than the sum of its proper divisors (721921).

7940999 is a wasteful number, since it uses less digits than its factorization.

7940999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721920.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 7940999 is about 2817.9778210625. The cubic root of 7940999 is about 199.5071113015.

The spelling of 7940999 in words is "seven million, nine hundred forty thousand, nine hundred ninety-nine".