2399669 has 4 divisors (see below), whose sum is σ = 2540844. Its totient is φ = 2258496.

The previous prime is 2399653. The next prime is 2399671. The reversal of 2399669 is 9669932.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1612900 + 786769 = 1270^2 + 887^2 .

It is a cyclic number.

It is not a de Polignac number, because 2399669 - 2⁴ = 2399653 is a prime.

It is a super-2 number, since 2×2399669² = 11516822619122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399629) 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, 70562 + ... + 70595.

It is an arithmetic number, because the mean of its divisors is an integer number (635211).

2^2399669 is an apocalyptic number.

It is an amenable number.

2399669 is a deficient number, since it is larger than the sum of its proper divisors (141175).

2399669 is a wasteful number, since it uses less digits than its factorization.

2399669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141174.

The product of its digits is 157464, while the sum is 44.

The square root of 2399669 is about 1549.0865050087. The cubic root of 2399669 is about 133.8804346694.

The spelling of 2399669 in words is "two million, three hundred ninety-nine thousand, six hundred sixty-nine".