2231905 has 8 divisors (see below), whose sum is σ = 2884392. Its totient is φ = 1648128.

The previous prime is 2231891. The next prime is 2231909. The reversal of 2231905 is 5091322.

It can be written as a sum of positive squares in 4 ways, for example, as 20736 + 2211169 = 144^2 + 1487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2231905 - 2¹³ = 2223713 is a prime.

It is a super-3 number, since 3×2231905³ = 33354034225771627875, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2231909) 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, 17104 + ... + 17233.

It is an arithmetic number, because the mean of its divisors is an integer number (360549).

2^2231905 is an apocalyptic number.

It is an amenable number.

2231905 is a deficient number, since it is larger than the sum of its proper divisors (652487).

2231905 is a wasteful number, since it uses less digits than its factorization.

2231905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34355.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2231905 is about 1493.9561573219. The cubic root of 2231905 is about 130.6848473881.

It can be divided in two parts, 2231 and 905, that added together give a square (3136 = 56²).

The spelling of 2231905 in words is "two million, two hundred thirty-one thousand, nine hundred five".