2261638 has 4 divisors (see below), whose sum is σ = 3392460. Its totient is φ = 1130818.

The previous prime is 2261621. The next prime is 2261639. The reversal of 2261638 is 8361622.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2261639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565408 + ... + 565411.

It is an arithmetic number, because the mean of its divisors is an integer number (848115).

2^2261638 is an apocalyptic number.

2261638 is a deficient number, since it is larger than the sum of its proper divisors (1130822).

2261638 is a wasteful number, since it uses less digits than its factorization.

2261638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130821.

The product of its digits is 3456, while the sum is 28.

The square root of 2261638 is about 1503.8743298561. The cubic root of 2261638 is about 131.2626086149.

The spelling of 2261638 in words is "two million, two hundred sixty-one thousand, six hundred thirty-eight".