2153999 has 4 divisors (see below), whose sum is σ = 2204136. Its totient is φ = 2103864.

The previous prime is 2153993. The next prime is 2154007. The reversal of 2153999 is 9993512.

2153999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2153999 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 (2153993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25004 + ... + 25089.

It is an arithmetic number, because the mean of its divisors is an integer number (551034).

2^2153999 is an apocalyptic number.

2153999 is a deficient number, since it is larger than the sum of its proper divisors (50137).

2153999 is an equidigital number, since it uses as much as digits as its factorization.

2153999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50136.

The product of its digits is 21870, while the sum is 38.

The square root of 2153999 is about 1467.6508440361. The cubic root of 2153999 is about 129.1462596041.

The spelling of 2153999 in words is "two million, one hundred fifty-three thousand, nine hundred ninety-nine".