3972091 has 2 divisors, whose sum is σ = 3972092. Its totient is φ = 3972090.

The previous prime is 3972071. The next prime is 3972103. The reversal of 3972091 is 1902793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3972091 - 2⁷ = 3971963 is a prime.

3972091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3972011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986045 + 1986046.

It is an arithmetic number, because the mean of its divisors is an integer number (1986046).

Almost surely, 2^3972091 is an apocalyptic number.

3972091 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972091 is an equidigital number, since it uses as much as digits as its factorization.

3972091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 3972091 is about 1993.0105368512. The cubic root of 3972091 is about 158.3700534101.

The spelling of 3972091 in words is "three million, nine hundred seventy-two thousand, ninety-one".