3972439 has 2 divisors, whose sum is σ = 3972440. Its totient is φ = 3972438.

The previous prime is 3972427. The next prime is 3972467. The reversal of 3972439 is 9342793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3972439 - 2¹⁵ = 3939671 is a prime.

It is a d-powerful number, because it can be written as 3⁵ + 9 + 7⁷ + 2²¹ + 4¹⁰ + 3⁷ + 9³ .

It is a junction number, because it is equal to n+sod(n) for n = 3972398 and 3972407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3972499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986219 + 1986220.

It is an arithmetic number, because the mean of its divisors is an integer number (1986220).

Almost surely, 2^3972439 is an apocalyptic number.

3972439 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972439 is an equidigital number, since it uses as much as digits as its factorization.

3972439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 3972439 is about 1993.0978400470. The cubic root of 3972439 is about 158.3746782764.

The spelling of 3972439 in words is "three million, nine hundred seventy-two thousand, four hundred thirty-nine".