2539731 has 4 divisors (see below), whose sum is σ = 3386312. Its totient is φ = 1693152.

The previous prime is 2539699. The next prime is 2539753. The reversal of 2539731 is 1379352.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2539731 - 2⁵ = 2539699 is a prime.

It is a super-2 number, since 2×2539731² = 12900467104722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

2539731 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (2539231) 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, 423286 + ... + 423291.

It is an arithmetic number, because the mean of its divisors is an integer number (846578).

2^2539731 is an apocalyptic number.

2539731 is a deficient number, since it is larger than the sum of its proper divisors (846581).

2539731 is an equidigital number, since it uses as much as digits as its factorization.

2539731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846580.

The product of its digits is 5670, while the sum is 30.

The square root of 2539731 is about 1593.6533500106. The cubic root of 2539731 is about 136.4360821918.

The spelling of 2539731 in words is "two million, five hundred thirty-nine thousand, seven hundred thirty-one".