2840399 has 4 divisors (see below), whose sum is σ = 2844720. Its totient is φ = 2836080.

The previous prime is 2840393. The next prime is 2840417. The reversal of 2840399 is 9930482.

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

It is a cyclic number.

It is not a de Polignac number, because 2840399 - 2¹² = 2836303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840393) 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, 947 + ... + 2564.

It is an arithmetic number, because the mean of its divisors is an integer number (711180).

2^2840399 is an apocalyptic number.

2840399 is a deficient number, since it is larger than the sum of its proper divisors (4321).

2840399 is an equidigital number, since it uses as much as digits as its factorization.

2840399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 2840399 is about 1685.3483319480. The cubic root of 2840399 is about 141.6206066332.

The spelling of 2840399 in words is "two million, eight hundred forty thousand, three hundred ninety-nine".