1213722 has 12 divisors (see below), whose sum is σ = 2629770. Its totient is φ = 404568.

The previous prime is 1213721. The next prime is 1213741. The reversal of 1213722 is 2273121.

It can be written as a sum of positive squares in only one way, i.e., 1212201 + 1521 = 1101^2 + 39^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67429 = 1213722 / (1 + 2 + 1 + 3 + 7 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 1213695 and 1213704.

It is not an unprimeable number, because it can be changed into a prime (1213721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33697 + ... + 33732.

2^1213722 is an apocalyptic number.

1213722 is an abundant number, since it is smaller than the sum of its proper divisors (1416048).

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

1213722 is a wasteful number, since it uses less digits than its factorization.

1213722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67437 (or 67434 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 1213722 is about 1101.6905191568. The cubic root of 1213722 is about 106.6693727612.

Adding to 1213722 its reverse (2273121), we get a palindrome (3486843).

The spelling of 1213722 in words is "one million, two hundred thirteen thousand, seven hundred twenty-two".