3972749 has 4 divisors (see below), whose sum is σ = 4333920. Its totient is φ = 3611580.

The previous prime is 3972737. The next prime is 3972751. The reversal of 3972749 is 9472793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9472793 = 11 ⋅861163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972749 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 (3972649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180569 + ... + 180590.

It is an arithmetic number, because the mean of its divisors is an integer number (1083480).

Almost surely, 2^3972749 is an apocalyptic number.

It is an amenable number.

3972749 is a deficient number, since it is larger than the sum of its proper divisors (361171).

3972749 is a wasteful number, since it uses less digits than its factorization.

3972749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361170.

The product of its digits is 95256, while the sum is 41.

The square root of 3972749 is about 1993.1756069148. The cubic root of 3972749 is about 158.3787979011.

The spelling of 3972749 in words is "three million, nine hundred seventy-two thousand, seven hundred forty-nine".