2731987 has 2 divisors, whose sum is σ = 2731988. Its totient is φ = 2731986.

The previous prime is 2731979. The next prime is 2731997. The reversal of 2731987 is 7891372.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2731987 - 2³ = 2731979 is a prime.

It is not a weakly prime, because it can be changed into another prime (2731907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365993 + 1365994.

It is an arithmetic number, because the mean of its divisors is an integer number (1365994).

2^2731987 is an apocalyptic number.

2731987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731987 is an equidigital number, since it uses as much as digits as its factorization.

2731987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 2731987 is about 1652.8723483681. The cubic root of 2731987 is about 139.7953984116.

The spelling of 2731987 in words is "two million, seven hundred thirty-one thousand, nine hundred eighty-seven".