1145220 has 24 divisors (see below), whose sum is σ = 3206784. Its totient is φ = 305376.

The previous prime is 1145213. The next prime is 1145227. The reversal of 1145220 is 225411.

It is an interprime number because it is at equal distance from previous prime (1145213) and next prime (1145227).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1145220.

It is not an unprimeable number, because it can be changed into a prime (1145227) 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, 9484 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (133616).

2^1145220 is an apocalyptic number.

1145220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145220 is an abundant number, since it is smaller than the sum of its proper divisors (2061564).

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

1145220 is a wasteful number, since it uses less digits than its factorization.

1145220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19099 (or 19097 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1145220 is about 1070.1495222631. The cubic root of 1145220 is about 104.6235955870.

The spelling of 1145220 in words is "one million, one hundred forty-five thousand, two hundred twenty".