1172220 has 48 divisors (see below), whose sum is σ = 3752448. Its totient is φ = 267840.

The previous prime is 1172207. The next prime is 1172233. The reversal of 1172220 is 222711.

It is an interprime number because it is at equal distance from previous prime (1172207) and next prime (1172233).

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 1172220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976 + ... + 1815.

It is an arithmetic number, because the mean of its divisors is an integer number (78176).

2^1172220 is an apocalyptic number.

1172220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1172220 is an abundant number, since it is smaller than the sum of its proper divisors (2580228).

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

1172220 is a wasteful number, since it uses less digits than its factorization.

1172220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1172220 is about 1082.6910916785. The cubic root of 1172220 is about 105.4394282549.

Adding to 1172220 its reverse (222711), we get a palindrome (1394931).

The spelling of 1172220 in words is "one million, one hundred seventy-two thousand, two hundred twenty".