2645742 has 16 divisors (see below), whose sum is σ = 5772672. Its totient is φ = 801720.

The previous prime is 2645723. The next prime is 2645743. The reversal of 2645742 is 2475462.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁹ + 6⁴ + 4⁶ + 5³ + 7⁴ + 4⁷ + 2²¹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19978 + ... + 20109.

It is an arithmetic number, because the mean of its divisors is an integer number (360792).

2^2645742 is an apocalyptic number.

2645742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2645742 is an abundant number, since it is smaller than the sum of its proper divisors (3126930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2645742 is a wasteful number, since it uses less digits than its factorization.

2645742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40103.

The product of its digits is 13440, while the sum is 30.

The square root of 2645742 is about 1626.5736995292. The cubic root of 2645742 is about 138.3085931789.

It can be divided in two parts, 264 and 5742, that added together give a palindrome (6006).

The spelling of 2645742 in words is "two million, six hundred forty-five thousand, seven hundred forty-two".