2151873 has 8 divisors (see below), whose sum is σ = 3188000. Its totient is φ = 1434564.

The previous prime is 2151869. The next prime is 2151899. The reversal of 2151873 is 3781512.

It is not a de Polignac number, because 2151873 - 2² = 2151869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 79699 = 2151873 / (2 + 1 + 5 + 1 + 8 + 7 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151073) 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, 39823 + ... + 39876.

It is an arithmetic number, because the mean of its divisors is an integer number (398500).

2^2151873 is an apocalyptic number.

It is an amenable number.

2151873 is a deficient number, since it is larger than the sum of its proper divisors (1036127).

2151873 is an equidigital number, since it uses as much as digits as its factorization.

2151873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79708 (or 79702 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2151873 is about 1466.9263785207. The cubic root of 2151873 is about 129.1037564384.

The spelling of 2151873 in words is "two million, one hundred fifty-one thousand, eight hundred seventy-three".