2261810 has 16 divisors (see below), whose sum is σ = 4181976. Its totient is φ = 880128.

The previous prime is 2261807. The next prime is 2261827. The reversal of 2261810 is 181622.

It can be written as a sum of positive squares in 4 ways, for example, as 2163841 + 97969 = 1471^2 + 313^2 .

It is a super-2 number, since 2×2261810² = 10231568952200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2687 + ... + 3426.

2^2261810 is an apocalyptic number.

2261810 is a deficient number, since it is larger than the sum of its proper divisors (1920166).

2261810 is a wasteful number, since it uses less digits than its factorization.

2261810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6157.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2261810 is about 1503.9315143982. The cubic root of 2261810 is about 131.2659360846.

It can be divided in two parts, 226 and 1810, that multiplied together give a triangular number (409060 = T₉₀₄).

The spelling of 2261810 in words is "two million, two hundred sixty-one thousand, eight hundred ten".