2145889 has 8 divisors (see below), whose sum is σ = 2243520. Its totient is φ = 2050416.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145889 is 9885412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145889 - 2¹³ = 2137697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

2145889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2145839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1692 + ... + 2674.

It is an arithmetic number, because the mean of its divisors is an integer number (280440).

2^2145889 is an apocalyptic number.

It is an amenable number.

2145889 is a deficient number, since it is larger than the sum of its proper divisors (97631).

2145889 is an equidigital number, since it uses as much as digits as its factorization.

2145889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079.

The product of its digits is 23040, while the sum is 37.

The square root of 2145889 is about 1464.8853197435. The cubic root of 2145889 is about 128.9839733310.

Subtracting from 2145889 its product of digits (23040), we obtain a square (2122849 = 1457²).

The spelling of 2145889 in words is "two million, one hundred forty-five thousand, eight hundred eighty-nine".