2399749 has 8 divisors (see below), whose sum is σ = 2630880. Its totient is φ = 2170800.

The previous prime is 2399717. The next prime is 2399753. The reversal of 2399749 is 9479932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2399749 - 2⁵ = 2399717 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 3¹³ + 9³ + 9³ + 7⁵ + 4⁹ + 9³ .

It is a Duffinian number.

2399749 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2554 + ... + 3364.

It is an arithmetic number, because the mean of its divisors is an integer number (328860).

2^2399749 is an apocalyptic number.

It is an amenable number.

2399749 is a deficient number, since it is larger than the sum of its proper divisors (231131).

2399749 is a wasteful number, since it uses less digits than its factorization.

2399749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091.

The product of its digits is 122472, while the sum is 43.

The square root of 2399749 is about 1549.1123264631. The cubic root of 2399749 is about 133.8819224184.

The spelling of 2399749 in words is "two million, three hundred ninety-nine thousand, seven hundred forty-nine".