3907991 has 2 divisors, whose sum is σ = 3907992. Its totient is φ = 3907990.

The previous prime is 3907987. The next prime is 3908017. The reversal of 3907991 is 1997093.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3907991 - 2² = 3907987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3907951) 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 as a sum of consecutive naturals, namely, 1953995 + 1953996.

It is an arithmetic number, because the mean of its divisors is an integer number (1953996).

Almost surely, 2^3907991 is an apocalyptic number.

3907991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3907991 is an equidigital number, since it uses as much as digits as its factorization.

3907991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 3907991 is about 1976.8639305729. The cubic root of 3907991 is about 157.5135253355.

The spelling of 3907991 in words is "three million, nine hundred seven thousand, nine hundred ninety-one".