7900399494 has 144 divisors (see below), whose sum is σ = 19741627152. Its totient is φ = 2274435072.

The previous prime is 7900399487. The next prime is 7900399499. The reversal of 7900399494 is 4949930097.

It is a self number, because there is not a number n which added to its sum of digits gives 7900399494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7900399499) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11738742 + ... + 11739414.

It is an arithmetic number, because the mean of its divisors is an integer number (137094633).

Almost surely, 2^7900399494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7900399494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9870813576).

7900399494 is an abundant number, since it is smaller than the sum of its proper divisors (11841227658).

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

7900399494 is a wasteful number, since it uses less digits than its factorization.

7900399494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 935 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 7900399494 is about 88884.1914740748. The cubic root of 7900399494 is about 1991.6652722394.

The spelling of 7900399494 in words is "seven billion, nine hundred million, three hundred ninety-nine thousand, four hundred ninety-four".