2721520 has 20 divisors (see below), whose sum is σ = 6327720. Its totient is φ = 1088576.

The previous prime is 2721517. The next prime is 2721533. The reversal of 2721520 is 251272.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2721520² = 14813342220800, which contains 22 as substring.

It is a congruent number.

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, 16930 + ... + 17089.

It is an arithmetic number, because the mean of its divisors is an integer number (316386).

2^2721520 is an apocalyptic number.

2721520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2721520 is an abundant number, since it is smaller than the sum of its proper divisors (3606200).

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

2721520 is a wasteful number, since it uses less digits than its factorization.

2721520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34032 (or 34026 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2721520 is about 1649.7030035737. The cubic root of 2721520 is about 139.6166382744.

Adding to 2721520 its reverse (251272), we get a palindrome (2972792).

The spelling of 2721520 in words is "two million, seven hundred twenty-one thousand, five hundred twenty".