2145887 has 4 divisors (see below), whose sum is σ = 2152320. Its totient is φ = 2139456.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145887 is 7885412.

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

It is a cyclic number.

It is not a de Polignac number, because 2145887 - 2⁶ = 2145823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145827) 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, 2687 + ... + 3392.

It is an arithmetic number, because the mean of its divisors is an integer number (538080).

2^2145887 is an apocalyptic number.

2145887 is a deficient number, since it is larger than the sum of its proper divisors (6433).

2145887 is an equidigital number, since it uses as much as digits as its factorization.

2145887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432.

The product of its digits is 17920, while the sum is 35.

The square root of 2145887 is about 1464.8846370960. The cubic root of 2145887 is about 128.9839332593.

The spelling of 2145887 in words is "two million, one hundred forty-five thousand, eight hundred eighty-seven".