1963021636 has 9 divisors (see below), whose sum is σ = 3435442941. Its totient is φ = 981466512.

The previous prime is 1963021609. The next prime is 1963021639. The reversal of 1963021636 is 6361203691.

The square root of 1963021636 is 44306.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 109202500 + 1853819136 = 10450^2 + 43056^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1963021595 and 1963021604.

It is not an unprimeable number, because it can be changed into a prime (1963021639) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 77536 + ... + 99688.

Almost surely, 2^1963021636 is an apocalyptic number.

1963021636 is the 44306-th square number.

It is an amenable number.

1963021636 is a deficient number, since it is larger than the sum of its proper divisors (1472421305).

1963021636 is an frugal number, since it uses more digits than its factorization.

1963021636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44310 (or 22155 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The cubic root of 1963021636 is about 1252.1077263408.

The spelling of 1963021636 in words is "one billion, nine hundred sixty-three million, twenty-one thousand, six hundred thirty-six".