1220772 has 24 divisors (see below), whose sum is σ = 3255616. Its totient is φ = 348768.

The previous prime is 1220761. The next prime is 1220773. The reversal of 1220772 is 2770221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1220773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7183 + ... + 7350.

2^1220772 is an apocalyptic number.

1220772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220772 is an abundant number, since it is smaller than the sum of its proper divisors (2034844).

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

1220772 is a wasteful number, since it uses less digits than its factorization.

1220772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14547 (or 14545 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 1220772 is about 1104.8855144312. The cubic root of 1220772 is about 106.8755066492.

Adding to 1220772 its reverse (2770221), we get a palindrome (3990993).

The spelling of 1220772 in words is "one million, two hundred twenty thousand, seven hundred seventy-two".