2921987 has 2 divisors, whose sum is σ = 2921988. Its totient is φ = 2921986.

The previous prime is 2921981. The next prime is 2922041. The reversal of 2921987 is 7891292.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2921987 - 2⁶ = 2921923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2921987.

It is not a weakly prime, because it can be changed into another prime (2921981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1460993 + 1460994.

It is an arithmetic number, because the mean of its divisors is an integer number (1460994).

2^2921987 is an apocalyptic number.

2921987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2921987 is an equidigital number, since it uses as much as digits as its factorization.

2921987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 2921987 is about 1709.3820520878. The cubic root of 2921987 is about 142.9638032499.

The spelling of 2921987 in words is "two million, nine hundred twenty-one thousand, nine hundred eighty-seven".