7940499979 has 4 divisors (see below), whose sum is σ = 7940885976. Its totient is φ = 7940113984.

The previous prime is 7940499977. The next prime is 7940500019. The reversal of 7940499979 is 9799940497.

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

It is a cyclic number.

It is not a de Polignac number, because 7940499979 - 2¹ = 7940499977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7940499977) 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, 160294 + ... + 203899.

It is an arithmetic number, because the mean of its divisors is an integer number (1985221494).

Almost surely, 2^7940499979 is an apocalyptic number.

7940499979 is a deficient number, since it is larger than the sum of its proper divisors (385997).

7940499979 is a wasteful number, since it uses less digits than its factorization.

7940499979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385996.

The product of its (nonzero) digits is 46294416, while the sum is 67.

The square root of 7940499979 is about 89109.4831036518. The cubic root of 7940499979 is about 1995.0293213279.

The spelling of 7940499979 in words is "seven billion, nine hundred forty million, four hundred ninety-nine thousand, nine hundred seventy-nine".