2609869 has 4 divisors (see below), whose sum is σ = 2680444. Its totient is φ = 2539296.

The previous prime is 2609813. The next prime is 2609899. The reversal of 2609869 is 9689062.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9689062 = 2 ⋅4844531.

It can be written as a sum of positive squares in 2 ways, for example, as 2418025 + 191844 = 1555^2 + 438^2 .

It is a cyclic number.

It is not a de Polignac number, because 2609869 - 2⁹ = 2609357 is a prime.

It is a super-3 number, since 3×2609869³ = 53330711937205145727, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

2609869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2609809) 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 3 ways as a sum of consecutive naturals, for example, 35232 + ... + 35305.

It is an arithmetic number, because the mean of its divisors is an integer number (670111).

2^2609869 is an apocalyptic number.

It is an amenable number.

2609869 is a deficient number, since it is larger than the sum of its proper divisors (70575).

2609869 is an equidigital number, since it uses as much as digits as its factorization.

2609869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70574.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 2609869 is about 1615.5088981494. The cubic root of 2609869 is about 137.6806485091.

The spelling of 2609869 in words is "two million, six hundred nine thousand, eight hundred sixty-nine".