2499657 has 4 divisors (see below), whose sum is σ = 3332880. Its totient is φ = 1666436.

The previous prime is 2499643. The next prime is 2499661. The reversal of 2499657 is 7569942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2499657 - 2⁴ = 2499641 is a prime.

It is a D-number.

2499657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2499667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416607 + ... + 416612.

It is an arithmetic number, because the mean of its divisors is an integer number (833220).

2^2499657 is an apocalyptic number.

It is an amenable number.

2499657 is a deficient number, since it is larger than the sum of its proper divisors (833223).

2499657 is an equidigital number, since it uses as much as digits as its factorization.

2499657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833222.

The product of its digits is 136080, while the sum is 42.

The square root of 2499657 is about 1581.0303602398. The cubic root of 2499657 is about 135.7146735776.

It can be divided in two parts, 24 and 99657, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 2499657 in words is "two million, four hundred ninety-nine thousand, six hundred fifty-seven".