3972739 has 4 divisors (see below), whose sum is σ = 4109760. Its totient is φ = 3835720.

The previous prime is 3972737. The next prime is 3972751. The reversal of 3972739 is 9372793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9372793 = 1597 ⋅5869.

It is a cyclic number.

It is not a de Polignac number, because 3972739 - 2¹ = 3972737 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3972737) 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, 68467 + ... + 68524.

It is an arithmetic number, because the mean of its divisors is an integer number (1027440).

Almost surely, 2^3972739 is an apocalyptic number.

3972739 is a deficient number, since it is larger than the sum of its proper divisors (137021).

3972739 is a wasteful number, since it uses less digits than its factorization.

3972739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137020.

The product of its digits is 71442, while the sum is 40.

The square root of 3972739 is about 1993.1730983535. The cubic root of 3972739 is about 158.3786650133.

It can be divided in two parts, 397 and 2739, that added together give a square (3136 = 56²).

The spelling of 3972739 in words is "three million, nine hundred seventy-two thousand, seven hundred thirty-nine".