2857491 has 32 divisors (see below), whose sum is σ = 5214720. Its totient is φ = 1505952.

The previous prime is 2857471. The next prime is 2857493. The reversal of 2857491 is 1947582.

2857491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2857491 - 2⁶ = 2857427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2857493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1876 + ... + 3038.

It is an arithmetic number, because the mean of its divisors is an integer number (162960).

2^2857491 is an apocalyptic number.

2857491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2857491 is a deficient number, since it is larger than the sum of its proper divisors (2357229).

2857491 is a wasteful number, since it uses less digits than its factorization.

2857491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192 (or 1186 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2857491 is about 1690.4114883661. The cubic root of 2857491 is about 141.9041044006.

Subtracting from 2857491 its reverse (1947582), we obtain a palindrome (909909).

It can be divided in two parts, 285 and 7491, that added together give a 5-th power (7776 = 6⁵).

The spelling of 2857491 in words is "two million, eight hundred fifty-seven thousand, four hundred ninety-one".