2154243 has 24 divisors (see below), whose sum is σ = 3560448. Its totient is φ = 1134432.

The previous prime is 2154241. The next prime is 2154259. The reversal of 2154243 is 3424512.

It is not a de Polignac number, because 2154243 - 2¹ = 2154241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3246 + ... + 3852.

It is an arithmetic number, because the mean of its divisors is an integer number (148352).

2^2154243 is an apocalyptic number.

2154243 is a deficient number, since it is larger than the sum of its proper divisors (1406205).

2154243 is a wasteful number, since it uses less digits than its factorization.

2154243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 630 counting only the distinct ones).

The product of its digits is 960, while the sum is 21.

The square root of 2154243 is about 1467.7339677203. The cubic root of 2154243 is about 129.1511358827.

Adding to 2154243 its reverse (3424512), we get a palindrome (5578755).

The spelling of 2154243 in words is "two million, one hundred fifty-four thousand, two hundred forty-three".