2187969 has 16 divisors (see below), whose sum is σ = 3412992. Its totient is φ = 1220688.

The previous prime is 2187961. The next prime is 2187971. The reversal of 2187969 is 9697812.

It is not a de Polignac number, because 2187969 - 2³ = 2187961 is a prime.

It is a super-2 number, since 2×2187969² = 9574416689922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2187969.

It is not an unprimeable number, because it can be changed into a prime (2187961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (213312).

2^2187969 is an apocalyptic number.

It is an amenable number.

2187969 is a deficient number, since it is larger than the sum of its proper divisors (1225023).

2187969 is a wasteful number, since it uses less digits than its factorization.

2187969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476.

The product of its digits is 54432, while the sum is 42.

The square root of 2187969 is about 1479.1784882157. The cubic root of 2187969 is about 129.8216291395.

It can be divided in two parts, 21 and 87969, that added together give a triangular number (87990 = T₄₁₉).

The spelling of 2187969 in words is "two million, one hundred eighty-seven thousand, nine hundred sixty-nine".