3992987 has 2 divisors, whose sum is σ = 3992988. Its totient is φ = 3992986.

The previous prime is 3992959. The next prime is 3993019. The reversal of 3992987 is 7892993.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3992987 is a prime.

It is not a weakly prime, because it can be changed into another prime (3992917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996493 + 1996494.

It is an arithmetic number, because the mean of its divisors is an integer number (1996494).

Almost surely, 2^3992987 is an apocalyptic number.

3992987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3992987 is an equidigital number, since it uses as much as digits as its factorization.

3992987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 3992987 is about 1998.2459808542. The cubic root of 3992987 is about 158.6472805643.

The spelling of 3992987 in words is "three million, nine hundred ninety-two thousand, nine hundred eighty-seven".