3727991 has 2 divisors, whose sum is σ = 3727992. Its totient is φ = 3727990.

The previous prime is 3727961. The next prime is 3728017. The reversal of 3727991 is 1997273.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3727991 is a prime.

It is a Sophie Germain 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 (3727951) 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, 1863995 + 1863996.

It is an arithmetic number, because the mean of its divisors is an integer number (1863996).

Almost surely, 2^3727991 is an apocalyptic number.

3727991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3727991 is an equidigital number, since it uses as much as digits as its factorization.

3727991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 38.

The square root of 3727991 is about 1930.8006111455. The cubic root of 3727991 is about 155.0570861527.

The spelling of 3727991 in words is "three million, seven hundred twenty-seven thousand, nine hundred ninety-one".