2158623 has 16 divisors (see below), whose sum is σ = 3302400. Its totient is φ = 1392120.

The previous prime is 2158621. The next prime is 2158627. The reversal of 2158623 is 3268512.

It is not a de Polignac number, because 2158623 - 2¹ = 2158621 is a prime.

It is a super-2 number, since 2×2158623² = 9319306512258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2⁵ + 1 + 5³ + 8⁷ + 6³ + 2¹¹ + 3¹⁰ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158621) 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, 453 + ... + 2126.

It is an arithmetic number, because the mean of its divisors is an integer number (206400).

2^2158623 is an apocalyptic number.

2158623 is a deficient number, since it is larger than the sum of its proper divisors (1143777).

2158623 is a wasteful number, since it uses less digits than its factorization.

2158623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619 (or 2613 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2158623 is about 1469.2253060712. The cubic root of 2158623 is about 129.2386065204.

It can be divided in two parts, 21586 and 23, that added together give a square (21609 = 147²).

The spelling of 2158623 in words is "two million, one hundred fifty-eight thousand, six hundred twenty-three".