2399391 has 6 divisors (see below), whose sum is σ = 3465800. Its totient is φ = 1599588.

The previous prime is 2399389. The next prime is 2399399. The reversal of 2399391 is 1939932.

It is not a de Polignac number, because 2399391 - 2¹ = 2399389 is a prime.

It is a Duffinian number.

2399391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133291 + ... + 133308.

2^2399391 is an apocalyptic number.

2399391 is a deficient number, since it is larger than the sum of its proper divisors (1066409).

2399391 is a wasteful number, since it uses less digits than its factorization.

2399391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266605 (or 266602 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 2399391 is about 1548.9967721077. The cubic root of 2399391 is about 133.8752644844.

The spelling of 2399391 in words is "two million, three hundred ninety-nine thousand, three hundred ninety-one".