2499939 has 24 divisors (see below), whose sum is σ = 4062240. Its totient is φ = 1469952.

The previous prime is 2499923. The next prime is 2499941. The reversal of 2499939 is 9399942.

Added to its reverse (9399942) it gives a triangular number (11899881 = T₄₈₇₈).

It is not a de Polignac number, because 2499939 - 2⁴ = 2499923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2499894 and 2499903.

It is not an unprimeable number, because it can be changed into a prime (2499919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2227 + ... + 3155.

It is an arithmetic number, because the mean of its divisors is an integer number (169260).

2^2499939 is an apocalyptic number.

2499939 is a deficient number, since it is larger than the sum of its proper divisors (1562301).

2499939 is a wasteful number, since it uses less digits than its factorization.

2499939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 968 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 2499939 is about 1581.1195400728. The cubic root of 2499939 is about 135.7197769576.

Adding to 2499939 its reverse (9399942), we get a triangular number (11899881 = T₄₈₇₈).

The spelling of 2499939 in words is "two million, four hundred ninety-nine thousand, nine hundred thirty-nine".