3972109865 has 8 divisors (see below), whose sum is σ = 4767715968. Its totient is φ = 3176898480.

The previous prime is 3972109859. The next prime is 3972109871. The reversal of 3972109865 is 5689012793.

It is an interprime number because it is at equal distance from previous prime (3972109859) and next prime (3972109871).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-3972109865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76067 + ... + 117176.

It is an arithmetic number, because the mean of its divisors is an integer number (595964496).

Almost surely, 2^3972109865 is an apocalyptic number.

It is an amenable number.

3972109865 is a deficient number, since it is larger than the sum of its proper divisors (795606103).

3972109865 is a wasteful number, since it uses less digits than its factorization.

3972109865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197359.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 3972109865 is about 63024.6766354259. The cubic root of 3972109865 is about 1583.7030412997.

The spelling of 3972109865 in words is "three billion, nine hundred seventy-two million, one hundred nine thousand, eight hundred sixty-five".