2873781 has 12 divisors (see below), whose sum is σ = 4331808. Its totient is φ = 1832424.

The previous prime is 2873777. The next prime is 2873789. The reversal of 2873781 is 1873782.

2873781 is a `hidden beast` number, since 287 + 378 + 1 = 666.

It is not a de Polignac number, because 2873781 - 2² = 2873777 is a prime.

It is a super-2 number, since 2×2873781² = 16517234471922, which contains 22 as substring.

It is a Curzon number.

2873781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2873789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6735 + ... + 7148.

It is an arithmetic number, because the mean of its divisors is an integer number (360984).

2^2873781 is an apocalyptic number.

It is an amenable number.

2873781 is a deficient number, since it is larger than the sum of its proper divisors (1458027).

2873781 is a wasteful number, since it uses less digits than its factorization.

2873781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13912 (or 13909 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 2873781 is about 1695.2229941810. Note that the first 3 decimals coincide. The cubic root of 2873781 is about 142.1732494916.

Subtracting from 2873781 its reverse (1873782), we obtain a palindrome (999999).

The spelling of 2873781 in words is "two million, eight hundred seventy-three thousand, seven hundred eighty-one".