1221172 has 12 divisors (see below), whose sum is σ = 2145220.
Its totient is φ = 608256.
The previous prime is 1221167. The next prime is 1221193. The reversal of 1221172 is 2711221.
Adding to 1221172 its reverse (2711221), we get a palindrome (3932393).
It can be divided in two parts, 1221 and 172, that multiplied together give a palindrome (210012).
It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 571536 = 806^2 + 756^2
It is a super-2 number, since 2×12211722 = 2982522107168, which contains 22 as substring.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204 + ... + 1972.
21221172 is an apocalyptic number.
It is an amenable number.
1221172 is a deficient number, since it is larger than the sum of its proper divisors (924048).
1221172 is a wasteful number, since it uses less digits than its factorization.
1221172 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1170 (or 1168 counting only the distinct ones).
The product of its digits is 56, while the sum is 16.
The square root of 1221172 is about 1105.0665138353.
The cubic root of 1221172 is about 106.8871783712.
The spelling of 1221172 in words is "one million, two hundred twenty-one thousand, one hundred seventy-two".