2154239 has 4 divisors (see below), whose sum is σ = 2267640. Its totient is φ = 2040840.

The previous prime is 2154227. The next prime is 2154241. The reversal of 2154239 is 9324512.

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 2154239 - 2¹⁶ = 2088703 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154209) 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, 56672 + ... + 56709.

It is an arithmetic number, because the mean of its divisors is an integer number (566910).

2^2154239 is an apocalyptic number.

2154239 is a deficient number, since it is larger than the sum of its proper divisors (113401).

2154239 is a wasteful number, since it uses less digits than its factorization.

2154239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113400.

The product of its digits is 2160, while the sum is 26.

The square root of 2154239 is about 1467.7326050749. The cubic root of 2154239 is about 129.1510559467.

The spelling of 2154239 in words is "two million, one hundred fifty-four thousand, two hundred thirty-nine".