11722500 has 90 divisors (see below), whose sum is σ = 37099062. Its totient is φ = 3120000.

The previous prime is 11722499. The next prime is 11722511. The reversal of 11722500 is 522711.

11722500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 5875776 + 5846724 = 2424^2 + 2418^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a zygodrome in base 5.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 22240 + ... + 22760.

Almost surely, 2^11722500 is an apocalyptic number.

11722500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11722500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18549531).

11722500 is an abundant number, since it is smaller than the sum of its proper divisors (25376562).

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

11722500 is a wasteful number, since it uses less digits than its factorization.

11722500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 11722500 is about 3423.8136631540. The cubic root of 11722500 is about 227.1642997947.

The spelling of 11722500 in words is "eleven million, seven hundred twenty-two thousand, five hundred".