2909869 has 4 divisors (see below), whose sum is σ = 3063040. Its totient is φ = 2756700.

The previous prime is 2909867. The next prime is 2909909. The reversal of 2909869 is 9689092.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2909869 - 2¹ = 2909867 is a prime.

It is a super-2 number, since 2×2909869² = 16934675194322, which contains 22 as substring.

It is a Duffinian number.

2909869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2909867) 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, 76557 + ... + 76594.

It is an arithmetic number, because the mean of its divisors is an integer number (765760).

2^2909869 is an apocalyptic number.

It is an amenable number.

2909869 is a deficient number, since it is larger than the sum of its proper divisors (153171).

2909869 is a wasteful number, since it uses less digits than its factorization.

2909869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153170.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 2909869 is about 1705.8338137111. The cubic root of 2909869 is about 142.7658973036.

The spelling of 2909869 in words is "two million, nine hundred nine thousand, eight hundred sixty-nine".