2145787 has 4 divisors (see below), whose sum is σ = 2452336. Its totient is φ = 1839240.

The previous prime is 2145779. The next prime is 2145821. The reversal of 2145787 is 7875412.

It is a happy number.

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 2145787 - 2³ = 2145779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145707) 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, 153264 + ... + 153277.

It is an arithmetic number, because the mean of its divisors is an integer number (613084).

2^2145787 is an apocalyptic number.

2145787 is a deficient number, since it is larger than the sum of its proper divisors (306549).

2145787 is an equidigital number, since it uses as much as digits as its factorization.

2145787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306548.

The product of its digits is 15680, while the sum is 34.

The square root of 2145787 is about 1464.8505043178. The cubic root of 2145787 is about 128.9819296444.

The spelling of 2145787 in words is "two million, one hundred forty-five thousand, seven hundred eighty-seven".