2399979 has 4 divisors (see below), whose sum is σ = 3199976. Its totient is φ = 1599984.

The previous prime is 2399977. The next prime is 2399983. The reversal of 2399979 is 9799932.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2399979 - 2¹ = 2399977 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2399977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399994 + ... + 399999.

It is an arithmetic number, because the mean of its divisors is an integer number (799994).

2^2399979 is an apocalyptic number.

2399979 is a deficient number, since it is larger than the sum of its proper divisors (799997).

2399979 is an equidigital number, since it uses as much as digits as its factorization.

2399979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799996.

The product of its digits is 275562, while the sum is 48.

The square root of 2399979 is about 1549.1865607473. The cubic root of 2399979 is about 133.8861995127.

The spelling of 2399979 in words is "two million, three hundred ninety-nine thousand, nine hundred seventy-nine".