2521540 has 72 divisors (see below), whose sum is σ = 6435072. Its totient is φ = 826560.

The previous prime is 2521537. The next prime is 2521591. The reversal of 2521540 is 451252.

2521540 = T₂₉₆ + T₂₉₇ + ... + T₃₄₄.

2521540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30339 + ... + 30421.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2^2521540 is an apocalyptic number.

2521540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2521540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3217536).

2521540 is an abundant number, since it is smaller than the sum of its proper divisors (3913532).

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

2521540 is a wasteful number, since it uses less digits than its factorization.

2521540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2521540 is about 1587.9357669629. The cubic root of 2521540 is about 136.1095570495.

Adding to 2521540 its reverse (451252), we get a palindrome (2972792).

The spelling of 2521540 in words is "two million, five hundred twenty-one thousand, five hundred forty".