2231405 has 16 divisors (see below), whose sum is σ = 3024000. Its totient is φ = 1565760.

The previous prime is 2231389. The next prime is 2231407. The reversal of 2231405 is 5041322.

It is not a de Polignac number, because 2231405 - 2⁴ = 2231389 is a prime.

It is a super-3 number, since 3×2231405³ = 33331622947502265375, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896 + ... + 2294.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

2^2231405 is an apocalyptic number.

It is an amenable number.

2231405 is a deficient number, since it is larger than the sum of its proper divisors (792595).

2231405 is a wasteful number, since it uses less digits than its factorization.

2231405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 2231405 is about 1493.7888070273. The cubic root of 2231405 is about 130.6750878174.

Adding to 2231405 its reverse (5041322), we get a palindrome (7272727).

The spelling of 2231405 in words is "two million, two hundred thirty-one thousand, four hundred five".