2291690 has 16 divisors (see below), whose sum is σ = 4167720. Its totient is φ = 907200.

The previous prime is 2291683. The next prime is 2291699. The reversal of 2291690 is 961922.

It can be written as a sum of positive squares in 4 ways, for example, as 1841449 + 450241 = 1357^2 + 671^2 .

It is a super-2 number, since 2×2291690² = 10503686112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2291699) 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, 125 + ... + 2144.

2^2291690 is an apocalyptic number.

2291690 is a deficient number, since it is larger than the sum of its proper divisors (1876030).

2291690 is a wasteful number, since it uses less digits than its factorization.

2291690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2291690 is about 1513.8328837755. The cubic root of 2291690 is about 131.8414456833.

The spelling of 2291690 in words is "two million, two hundred ninety-one thousand, six hundred ninety".