3972729 has 8 divisors (see below), whose sum is σ = 5575840. Its totient is φ = 2509056.

The previous prime is 3972697. The next prime is 3972737. The reversal of 3972729 is 9272793.

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

It is not a de Polignac number, because 3972729 - 2⁵ = 3972697 is a prime.

It is a Duffinian number.

3972729 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34792 + ... + 34905.

It is an arithmetic number, because the mean of its divisors is an integer number (696980).

Almost surely, 2^3972729 is an apocalyptic number.

It is an amenable number.

3972729 is a deficient number, since it is larger than the sum of its proper divisors (1603111).

3972729 is a wasteful number, since it uses less digits than its factorization.

3972729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69719.

The product of its digits is 47628, while the sum is 39.

The square root of 3972729 is about 1993.1705897890. The cubic root of 3972729 is about 158.3785321253.

The spelling of 3972729 in words is "three million, nine hundred seventy-two thousand, seven hundred twenty-nine".