2521630 has 8 divisors (see below), whose sum is σ = 4538952. Its totient is φ = 1008648.

The previous prime is 2521621. The next prime is 2521643. The reversal of 2521630 is 361252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2521598 and 2521607.

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, 126072 + ... + 126091.

It is an arithmetic number, because the mean of its divisors is an integer number (567369).

2^2521630 is an apocalyptic number.

2521630 is a deficient number, since it is larger than the sum of its proper divisors (2017322).

2521630 is a wasteful number, since it uses less digits than its factorization.

2521630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252170.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2521630 is about 1587.9641053878. The cubic root of 2521630 is about 136.1111763925. Note that the first 4 decimals are identical.

Adding to 2521630 its reverse (361252), we get a palindrome (2882882).

The spelling of 2521630 in words is "two million, five hundred twenty-one thousand, six hundred thirty".