2231720 has 16 divisors (see below), whose sum is σ = 5021460. Its totient is φ = 892672.

The previous prime is 2231717. The next prime is 2231731. The reversal of 2231720 is 271322.

It can be written as a sum of positive squares in 2 ways, for example, as 1999396 + 232324 = 1414^2 + 482^2 .

It is a super-3 number, since 3×2231720³ = 33345740882353344000, which contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27857 + ... + 27936.

2^2231720 is an apocalyptic number.

2231720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2231720 is an abundant number, since it is smaller than the sum of its proper divisors (2789740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2231720 is a wasteful number, since it uses less digits than its factorization.

2231720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55804 (or 55800 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 2231720 is about 1493.8942398979. The cubic root of 2231720 is about 130.6812365169.

The spelling of 2231720 in words is "two million, two hundred thirty-one thousand, seven hundred twenty".