7974199836 has 72 divisors (see below), whose sum is σ = 20481661200. Its totient is φ = 2615348736.

The previous prime is 7974199799. The next prime is 7974199907. The reversal of 7974199836 is 6389914797.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3127090 + ... + 3129638.

Almost surely, 2^7974199836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7974199836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10240830600).

7974199836 is an abundant number, since it is smaller than the sum of its proper divisors (12507461364).

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

7974199836 is a wasteful number, since it uses less digits than its factorization.

7974199836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923 (or 3918 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 7974199836 is about 89298.3753267662. The cubic root of 7974199836 is about 1997.8476709040.

The spelling of 7974199836 in words is "seven billion, nine hundred seventy-four million, one hundred ninety-nine thousand, eight hundred thirty-six".