1997122 has 4 divisors (see below), whose sum is σ = 2995686. Its totient is φ = 998560.

The previous prime is 1997119. The next prime is 1997129. The reversal of 1997122 is 2217991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1901641 + 95481 = 1379^2 + 309^2 .

It is not an unprimeable number, because it can be changed into a prime (1997129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499279 + ... + 499282.

2^1997122 is an apocalyptic number.

1997122 is a deficient number, since it is larger than the sum of its proper divisors (998564).

1997122 is an equidigital number, since it uses as much as digits as its factorization.

1997122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998563.

The product of its digits is 2268, while the sum is 31.

The square root of 1997122 is about 1413.1956693961. The cubic root of 1997122 is about 125.9316417650.

It can be divided in two parts, 199712 and 2, that multiplied together give a square (399424 = 632²).

The spelling of 1997122 in words is "one million, nine hundred ninety-seven thousand, one hundred twenty-two".