2231520 has 48 divisors (see below), whose sum is σ = 7030800. Its totient is φ = 594944.

The previous prime is 2231519. The next prime is 2231533. The reversal of 2231520 is 251322.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×2231520³ = 33336776652263424000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2231520.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1845 + ... + 2804.

It is an arithmetic number, because the mean of its divisors is an integer number (146475).

2^2231520 is an apocalyptic number.

2231520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2231520 is an abundant number, since it is smaller than the sum of its proper divisors (4799280).

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

2231520 is a wasteful number, since it uses less digits than its factorization.

2231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4667 (or 4659 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 2231520 is about 1493.8272992552. The cubic root of 2231520 is about 130.6773326478.

Adding to 2231520 its reverse (251322), we get a palindrome (2482842).

The spelling of 2231520 in words is "two million, two hundred thirty-one thousand, five hundred twenty".