1961979796 has 18 divisors (see below), whose sum is σ = 3994030698. Its totient is φ = 840848400.

The previous prime is 1961979793. The next prime is 1961979839. The reversal of 1961979796 is 6979791691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1375371396 + 586608400 = 37086^2 + 24220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961979793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5004855 + ... + 5005246.

Almost surely, 2^1961979796 is an apocalyptic number.

It is an amenable number.

1961979796 is an abundant number, since it is smaller than the sum of its proper divisors (2032050902).

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

1961979796 is a wasteful number, since it uses less digits than its factorization.

1961979796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010119 (or 10010110 counting only the distinct ones).

The product of its digits is 11573604, while the sum is 64.

The square root of 1961979796 is about 44294.2411155220. The cubic root of 1961979796 is about 1251.8861755884.

The spelling of 1961979796 in words is "one billion, nine hundred sixty-one million, nine hundred seventy-nine thousand, seven hundred ninety-six".