2139523 has 4 divisors (see below), whose sum is σ = 2144608. Its totient is φ = 2134440.

The previous prime is 2139521. The next prime is 2139539. The reversal of 2139523 is 3259312.

It is a happy number.

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 2139523 - 2¹ = 2139521 is a prime.

It is a d-powerful number, because it can be written as 2¹⁵ + 1 + 3⁷ + 9³ + 5³ + 2²¹ + 3⁸ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139521) 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, 1848 + ... + 2773.

It is an arithmetic number, because the mean of its divisors is an integer number (536152).

2^2139523 is an apocalyptic number.

2139523 is a deficient number, since it is larger than the sum of its proper divisors (5085).

2139523 is an equidigital number, since it uses as much as digits as its factorization.

2139523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084.

The product of its digits is 1620, while the sum is 25.

The square root of 2139523 is about 1462.7108395031. The cubic root of 2139523 is about 128.8562989287.

It can be divided in two parts, 2139 and 523, that added together give a palindrome (2662).

The spelling of 2139523 in words is "two million, one hundred thirty-nine thousand, five hundred twenty-three".