2067891 has 16 divisors (see below), whose sum is σ = 3206400. Its totient is φ = 1160928.

The previous prime is 2067887. The next prime is 2067911. The reversal of 2067891 is 1987602.

It is not a de Polignac number, because 2067891 - 2² = 2067887 is a prime.

2067891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2067811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (200400).

2^2067891 is an apocalyptic number.

2067891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2067891 is a deficient number, since it is larger than the sum of its proper divisors (1138509).

2067891 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (2067890) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1738).

2067891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 2067891 is about 1438.0163420490. The cubic root of 2067891 is about 127.4018930030.

Multiplying 2067891 by its sum of digits (33), we get a triangular number (68240403 = T₁₁₆₈₂).

The spelling of 2067891 in words is "two million, sixty-seven thousand, eight hundred ninety-one".