2499981 has 24 divisors (see below), whose sum is σ = 3753792. Its totient is φ = 1478400.

The previous prime is 2499967. The next prime is 2499983. The reversal of 2499981 is 1899942.

It is not a de Polignac number, because 2499981 - 2⁵ = 2499949 is a prime.

It is a super-2 number, since 2×2499981² = 12499810000722, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2499983) 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, 25725 + ... + 25821.

It is an arithmetic number, because the mean of its divisors is an integer number (156408).

2^2499981 is an apocalyptic number.

It is an amenable number.

2499981 is a deficient number, since it is larger than the sum of its proper divisors (1253811).

2499981 is a wasteful number, since it uses less digits than its factorization.

2499981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 182 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 2499981 is about 1581.1328217452. The cubic root of 2499981 is about 135.7205370026.

The spelling of 2499981 in words is "two million, four hundred ninety-nine thousand, nine hundred eighty-one".