2521940 has 12 divisors (see below), whose sum is σ = 5296116. Its totient is φ = 1008768.

The previous prime is 2521921. The next prime is 2521949. The reversal of 2521940 is 491252.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 1592644 = 964^2 + 1262^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63029 + ... + 63068.

It is an arithmetic number, because the mean of its divisors is an integer number (441343).

2^2521940 is an apocalyptic number.

2521940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521940 is an abundant number, since it is smaller than the sum of its proper divisors (2774176).

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

2521940 is a wasteful number, since it uses less digits than its factorization.

2521940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126106 (or 126104 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2521940 is about 1588.0617116473. The cubic root of 2521940 is about 136.1167538346.

The spelling of 2521940 in words is "two million, five hundred twenty-one thousand, nine hundred forty".