11721630 has 16 divisors (see below), whose sum is σ = 28131984. Its totient is φ = 3125760.

The previous prime is 11721629. The next prime is 11721649. The reversal of 11721630 is 3612711.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11721597 and 11721606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195331 + ... + 195390.

It is an arithmetic number, because the mean of its divisors is an integer number (1758249).

Almost surely, 2^11721630 is an apocalyptic number.

11721630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11721630 is an abundant number, since it is smaller than the sum of its proper divisors (16410354).

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

11721630 is a wasteful number, since it uses less digits than its factorization.

11721630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390731.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 11721630 is about 3423.6866094898. The cubic root of 11721630 is about 227.1586798948.

The spelling of 11721630 in words is "eleven million, seven hundred twenty-one thousand, six hundred thirty".