11821506 has 16 divisors (see below), whose sum is σ = 23696064. Its totient is φ = 3931664.

The previous prime is 11821501. The next prime is 11821507. The reversal of 11821506 is 60512811.

It is not an unprimeable number, because it can be changed into a prime (11821501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (1481004).

Almost surely, 2^11821506 is an apocalyptic number.

11821506 is an abundant number, since it is smaller than the sum of its proper divisors (11874558).

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

11821506 is a wasteful number, since it uses less digits than its factorization.

11821506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4425.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 11821506 is about 3438.2417018005. The cubic root of 11821506 is about 227.8020365376.

The spelling of 11821506 in words is "eleven million, eight hundred twenty-one thousand, five hundred six".