3972147215 has 4 divisors (see below), whose sum is σ = 4766576664. Its totient is φ = 3177717768.

The previous prime is 3972147191. The next prime is 3972147217. The reversal of 3972147215 is 5127412793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5127412793 = 23 ⋅222930991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972147215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972147217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397214717 + ... + 397214726.

It is an arithmetic number, because the mean of its divisors is an integer number (1191644166).

Almost surely, 2^3972147215 is an apocalyptic number.

3972147215 is a deficient number, since it is larger than the sum of its proper divisors (794429449).

3972147215 is an equidigital number, since it uses as much as digits as its factorization.

3972147215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794429448.

The product of its digits is 105840, while the sum is 41.

The square root of 3972147215 is about 63024.9729472374. The cubic root of 3972147215 is about 1583.7080051707.

The spelling of 3972147215 in words is "three billion, nine hundred seventy-two million, one hundred forty-seven thousand, two hundred fifteen".