1211772 has 12 divisors (see below), whose sum is σ = 2827496. Its totient is φ = 403920.

The previous prime is 1211767. The next prime is 1211779. The reversal of 1211772 is 2771121.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50479 + ... + 50502.

2^1211772 is an apocalyptic number.

1211772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211772 is an abundant number, since it is smaller than the sum of its proper divisors (1615724).

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

1211772 is a wasteful number, since it uses less digits than its factorization.

1211772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100988 (or 100986 counting only the distinct ones).

The product of its digits is 196, while the sum is 21.

The square root of 1211772 is about 1100.8051598716. The cubic root of 1211772 is about 106.6122161328.

Adding to 1211772 its reverse (2771121), we get a palindrome (3982893).

It can be divided in two parts, 121 and 1772, that multiplied together give a palindrome (214412).

The spelling of 1211772 in words is "one million, two hundred eleven thousand, seven hundred seventy-two".