2188969 has 4 divisors (see below), whose sum is σ = 2201796. Its totient is φ = 2176144.

The previous prime is 2188919. The next prime is 2188981. The reversal of 2188969 is 9698812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 831744 + 1357225 = 912^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188969 - 2¹⁷ = 2057897 is a prime.

It is a super-2 number, since 2×2188969² = 9583170565922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2188909) 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, 6154 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (550449).

2^2188969 is an apocalyptic number.

It is an amenable number.

2188969 is a deficient number, since it is larger than the sum of its proper divisors (12827).

2188969 is a wasteful number, since it uses less digits than its factorization.

2188969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12826.

The product of its digits is 62208, while the sum is 43.

The square root of 2188969 is about 1479.5164750688. The cubic root of 2188969 is about 129.8414042301.

The spelling of 2188969 in words is "two million, one hundred eighty-eight thousand, nine hundred sixty-nine".