2155439 has 8 divisors (see below), whose sum is σ = 2532432. Its totient is φ = 1808640.

The previous prime is 2155429. The next prime is 2155451. The reversal of 2155439 is 9345512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155439 - 2⁴ = 2155423 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 (2155409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7394 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (316554).

2^2155439 is an apocalyptic number.

2155439 is a deficient number, since it is larger than the sum of its proper divisors (376993).

2155439 is a wasteful number, since it uses less digits than its factorization.

2155439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15097.

The product of its digits is 5400, while the sum is 29.

The square root of 2155439 is about 1468.1413419695. The cubic root of 2155439 is about 129.1750323175.

The spelling of 2155439 in words is "two million, one hundred fifty-five thousand, four hundred thirty-nine".