3972645826 has 4 divisors (see below), whose sum is σ = 5958968742. Its totient is φ = 1986322912.

The previous prime is 3972645791. The next prime is 3972645829. The reversal of 3972645826 is 6285462793.

3972645826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3711855625 + 260790201 = 60925^2 + 16149^2 .

It is not an unprimeable number, because it can be changed into a prime (3972645829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993161455 + ... + 993161458.

Almost surely, 2^3972645826 is an apocalyptic number.

3972645826 is a deficient number, since it is larger than the sum of its proper divisors (1986322916).

3972645826 is a wasteful number, since it uses less digits than its factorization.

3972645826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986322915.

The product of its digits is 4354560, while the sum is 52.

The square root of 3972645826 is about 63028.9284852598. The cubic root of 3972645826 is about 1583.7742683403.

The spelling of 3972645826 in words is "three billion, nine hundred seventy-two million, six hundred forty-five thousand, eight hundred twenty-six".