11273220 has 144 divisors (see below), whose sum is σ = 40884480. Its totient is φ = 2458368.

The previous prime is 11273209. The next prime is 11273231. The reversal of 11273220 is 2237211.

It is an interprime number because it is at equal distance from previous prime (11273209) and next prime (11273231).

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

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11273193 and 11273202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28786 + ... + 29174.

It is an arithmetic number, because the mean of its divisors is an integer number (283920).

Almost surely, 2^11273220 is an apocalyptic number.

11273220 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 11273220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20442240).

11273220 is an abundant number, since it is smaller than the sum of its proper divisors (29611260).

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

11273220 is a wasteful number, since it uses less digits than its factorization.

11273220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 11273220 is about 3357.5616152202. The cubic root of 11273220 is about 224.2242917103.

The spelling of 11273220 in words is "eleven million, two hundred seventy-three thousand, two hundred twenty".