2193987 has 16 divisors (see below), whose sum is σ = 3134720. Its totient is φ = 1360800.

The previous prime is 2193979. The next prime is 2194013. The reversal of 2193987 is 7893912.

It is not a de Polignac number, because 2193987 - 2³ = 2193979 is a prime.

It is a Duffinian number.

2193987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2193967) 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, 3162 + ... + 3792.

It is an arithmetic number, because the mean of its divisors is an integer number (195920).

2^2193987 is an apocalyptic number.

2193987 is a deficient number, since it is larger than the sum of its proper divisors (940733).

2193987 is a wasteful number, since it uses less digits than its factorization.

2193987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714.

The product of its digits is 27216, while the sum is 39.

The square root of 2193987 is about 1481.2113286091. The cubic root of 2193987 is about 129.9405448046.

The spelling of 2193987 in words is "two million, one hundred ninety-three thousand, nine hundred eighty-seven".