1961993872 has 30 divisors (see below), whose sum is σ = 3816229394. Its totient is φ = 977172480.

The previous prime is 1961993819. The next prime is 1961993879. The reversal of 1961993872 is 2783991691.

It can be written as a sum of positive squares in 3 ways, for example, as 553943296 + 1408050576 = 23536^2 + 37524^2 .

It is not an unprimeable number, because it can be changed into a prime (1961993879) 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, 3400048 + ... + 3400624.

Almost surely, 2^1961993872 is an apocalyptic number.

It is an amenable number.

1961993872 is a deficient number, since it is larger than the sum of its proper divisors (1854235522).

1961993872 is an frugal number, since it uses more digits than its factorization.

1961993872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507 (or 1040 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 55.

The square root of 1961993872 is about 44294.4000072244. The cubic root of 1961993872 is about 1251.8891694194.

The spelling of 1961993872 in words is "one billion, nine hundred sixty-one million, nine hundred ninety-three thousand, eight hundred seventy-two".