3972215636 has 6 divisors (see below), whose sum is σ = 6951377370. Its totient is φ = 1986107816.

The previous prime is 3972215633. The next prime is 3972215641. The reversal of 3972215636 is 6365122793.

3972215636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3191572036 + 780643600 = 56494^2 + 27940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972215633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496526951 + ... + 496526958.

It is an arithmetic number, because the mean of its divisors is an integer number (1158562895).

Almost surely, 2^3972215636 is an apocalyptic number.

It is an amenable number.

3972215636 is a deficient number, since it is larger than the sum of its proper divisors (2979161734).

3972215636 is a wasteful number, since it uses less digits than its factorization.

3972215636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993053913 (or 993053911 counting only the distinct ones).

The product of its digits is 408240, while the sum is 44.

The square root of 3972215636 is about 63025.5157535422. The cubic root of 3972215636 is about 1583.7170983435.

The spelling of 3972215636 in words is "three billion, nine hundred seventy-two million, two hundred fifteen thousand, six hundred thirty-six".