2499921 has 12 divisors (see below), whose sum is σ = 3652740. Its totient is φ = 1647360.

The previous prime is 2499919. The next prime is 2499923. The reversal of 2499921 is 1299942.

It is an interprime number because it is at equal distance from previous prime (2499919) and next prime (2499923).

It can be written as a sum of positive squares in 2 ways, for example, as 140625 + 2359296 = 375^2 + 1536^2 .

It is not a de Polignac number, because 2499921 - 2¹ = 2499919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2499923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 760 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (304395).

2^2499921 is an apocalyptic number.

It is an amenable number.

2499921 is a deficient number, since it is larger than the sum of its proper divisors (1152819).

2499921 is a wasteful number, since it uses less digits than its factorization.

2499921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216 (or 3213 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 2499921 is about 1581.1138478933. The cubic root of 2499921 is about 135.7194512214.

The spelling of 2499921 in words is "two million, four hundred ninety-nine thousand, nine hundred twenty-one".