1220172 has 12 divisors (see below), whose sum is σ = 2847096. Its totient is φ = 406720.

The previous prime is 1220171. The next prime is 1220203. The reversal of 1220172 is 2710221.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1220171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50829 + ... + 50852.

It is an arithmetic number, because the mean of its divisors is an integer number (237258).

2^1220172 is an apocalyptic number.

1220172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220172 is an abundant number, since it is smaller than the sum of its proper divisors (1626924).

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

1220172 is a wasteful number, since it uses less digits than its factorization.

1220172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101688 (or 101686 counting only the distinct ones).

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

The square root of 1220172 is about 1104.6139597162. The cubic root of 1220172 is about 106.8579942848.

Adding to 1220172 its reverse (2710221), we get a palindrome (3930393).

It can be divided in two parts, 12 and 20172, that multiplied together give a square (242064 = 492²).

The spelling of 1220172 in words is "one million, two hundred twenty thousand, one hundred seventy-two".