11851220 has 12 divisors (see below), whose sum is σ = 24887604. Its totient is φ = 4740480.

The previous prime is 11851219. The next prime is 11851291. The reversal of 11851220 is 2215811.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7474756 + 4376464 = 2734^2 + 2092^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 592561 = 11851220 / (1 + 1 + 8 + 5 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 11851192 and 11851201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296261 + ... + 296300.

It is an arithmetic number, because the mean of its divisors is an integer number (2073967).

Almost surely, 2^11851220 is an apocalyptic number.

11851220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11851220 is an abundant number, since it is smaller than the sum of its proper divisors (13036384).

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

11851220 is a wasteful number, since it uses less digits than its factorization.

11851220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592570 (or 592568 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 11851220 is about 3442.5600938836. The cubic root of 11851220 is about 227.9927411252.

The spelling of 11851220 in words is "eleven million, eight hundred fifty-one thousand, two hundred twenty".