2491857 has 16 divisors (see below), whose sum is σ = 3783360. Its totient is φ = 1620000.

The previous prime is 2491847. The next prime is 2491861. The reversal of 2491857 is 7581942.

It is not a de Polignac number, because 2491857 - 2⁷ = 2491729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2491837) 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, 19 + ... + 2232.

It is an arithmetic number, because the mean of its divisors is an integer number (236460).

2^2491857 is an apocalyptic number.

2491857 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2491857 is a deficient number, since it is larger than the sum of its proper divisors (1291503).

2491857 is a wasteful number, since it uses less digits than its factorization.

2491857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301 (or 2295 counting only the distinct ones).

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

The square root of 2491857 is about 1578.5616871063. The cubic root of 2491857 is about 135.5733638652.

The spelling of 2491857 in words is "two million, four hundred ninety-one thousand, eight hundred fifty-seven".