1209722 has 4 divisors (see below), whose sum is σ = 1814586. Its totient is φ = 604860.

The previous prime is 1209709. The next prime is 1209739. The reversal of 1209722 is 2279021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2279021 = 61 ⋅37361.

It can be written as a sum of positive squares in only one way, i.e., 1042441 + 167281 = 1021^2 + 409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302429 + ... + 302432.

2^1209722 is an apocalyptic number.

1209722 is a deficient number, since it is larger than the sum of its proper divisors (604864).

1209722 is an equidigital number, since it uses as much as digits as its factorization.

1209722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604863.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1209722 is about 1099.8736291047. The cubic root of 1209722 is about 106.5520622411.

The spelling of 1209722 in words is "one million, two hundred nine thousand, seven hundred twenty-two".