2291986 has 16 divisors (see below), whose sum is σ = 3643200. Its totient is φ = 1079568.

The previous prime is 2291983. The next prime is 2291987. The reversal of 2291986 is 6891922.

It is not an unprimeable number, because it can be changed into a prime (2291983) 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, 2035 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (227700).

2^2291986 is an apocalyptic number.

2291986 is a deficient number, since it is larger than the sum of its proper divisors (1351214).

2291986 is a wasteful number, since it uses less digits than its factorization.

2291986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993.

The product of its digits is 15552, while the sum is 37.

The square root of 2291986 is about 1513.9306457034. The cubic root of 2291986 is about 131.8471217546.

It can be divided in two parts, 22919 and 86, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 2291986 in words is "two million, two hundred ninety-one thousand, nine hundred eighty-six".