2521206 has 40 divisors (see below), whose sum is σ = 5749920. Its totient is φ = 825552.

The previous prime is 2521171. The next prime is 2521223. The reversal of 2521206 is 6021252.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12700 + ... + 12896.

It is an arithmetic number, because the mean of its divisors is an integer number (143748).

2^2521206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2521206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2874960).

2521206 is an abundant number, since it is smaller than the sum of its proper divisors (3228714).

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

2521206 is a wasteful number, since it uses less digits than its factorization.

2521206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2521206 is about 1587.8305954981. The cubic root of 2521206 is about 136.1035471509.

Adding to 2521206 its reverse (6021252), we get a palindrome (8542458).

The spelling of 2521206 in words is "two million, five hundred twenty-one thousand, two hundred six".