2190399 has 16 divisors (see below), whose sum is σ = 3201120. Its totient is φ = 1326080.

The previous prime is 2190389. The next prime is 2190403. The reversal of 2190399 is 9930912.

It is a Cunningham number, because it is equal to 1480²-1.

It is a cyclic number.

It is not a de Polignac number, because 2190399 - 2⁷ = 2190271 is a prime.

2190399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739 + ... + 2219.

It is an arithmetic number, because the mean of its divisors is an integer number (200070).

2^2190399 is an apocalyptic number.

2190399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2190399 is a deficient number, since it is larger than the sum of its proper divisors (1010721).

2190399 is a wasteful number, since it uses less digits than its factorization.

2190399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 2190399 is about 1479.9996621621. Note that the first 3 decimals coincide. The cubic root of 2190399 is about 129.8696721485.

The spelling of 2190399 in words is "two million, one hundred ninety thousand, three hundred ninety-nine".