2145987 has 8 divisors (see below), whose sum is σ = 3179280. Its totient is φ = 1430640.

The previous prime is 2145977. The next prime is 2145991. The reversal of 2145987 is 7895412.

2145987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2145987 - 2¹² = 2141891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39714 + ... + 39767.

It is an arithmetic number, because the mean of its divisors is an integer number (397410).

2^2145987 is an apocalyptic number.

2145987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2145987 is a deficient number, since it is larger than the sum of its proper divisors (1033293).

2145987 is an equidigital number, since it uses as much as digits as its factorization.

2145987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79490 (or 79484 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2145987 is about 1464.9187690790. The cubic root of 2145987 is about 128.9859368120.

The spelling of 2145987 in words is "two million, one hundred forty-five thousand, nine hundred eighty-seven".