2499979 has 4 divisors (see below), whose sum is σ = 2567584.
Its totient is φ = 2432376.
The previous prime is 2499967. The next prime is 2499983. The reversal of 2499979 is 9799942.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9799942 = 2 ⋅4899971.
It is a cyclic number.
It is not a de Polignac number, because 2499979 - 25 = 2499947 is a prime.
It is a Duffinian number.
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 3 ways as a sum of consecutive naturals, for example, 33747 + ... + 33820.
It is an arithmetic number, because the mean of its divisors is an integer number (641896).
22499979 is an apocalyptic number.
2499979 is a deficient number, since it is larger than the sum of its proper divisors (67605).
2499979 is an equidigital number, since it uses as much as digits as its factorization.
2499979 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 67604.
The product of its digits is 367416, while the sum is 49.
The square root of 2499979 is about 1581.1321892872.
The cubic root of 2499979 is about 135.7205008102.
The spelling of 2499979 in words is "two million, four hundred ninety-nine thousand, nine hundred seventy-nine".