2791287 has 16 divisors (see below), whose sum is σ = 4199680. Its totient is φ = 1831896.

The previous prime is 2791267. The next prime is 2791297. The reversal of 2791287 is 7821972.

It is not a de Polignac number, because 2791287 - 2⁸ = 2791031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2791237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1038 + ... + 2580.

It is an arithmetic number, because the mean of its divisors is an integer number (262480).

2^2791287 is an apocalyptic number.

2791287 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2791287 is a deficient number, since it is larger than the sum of its proper divisors (1408393).

2791287 is a wasteful number, since it uses less digits than its factorization.

2791287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619 (or 1613 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2791287 is about 1670.7145178037. The cubic root of 2791287 is about 140.7996248430.

The spelling of 2791287 in words is "two million, seven hundred ninety-one thousand, two hundred eighty-seven".