3972139 has 2 divisors, whose sum is σ = 3972140. Its totient is φ = 3972138.

The previous prime is 3972119. The next prime is 3972151. The reversal of 3972139 is 9312793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3972139 - 2⁵ = 3972107 is a prime.

It is not a weakly prime, because it can be changed into another prime (3972119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986069 + 1986070.

It is an arithmetic number, because the mean of its divisors is an integer number (1986070).

Almost surely, 2^3972139 is an apocalyptic number.

3972139 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972139 is an equidigital number, since it uses as much as digits as its factorization.

3972139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 34.

The square root of 3972139 is about 1993.0225788987. The cubic root of 3972139 is about 158.3706913388.

The spelling of 3972139 in words is "three million, nine hundred seventy-two thousand, one hundred thirty-nine".