1988722 has 8 divisors (see below), whose sum is σ = 3032172. Its totient is φ = 978000.

The previous prime is 1988699. The next prime is 1988729. The reversal of 1988722 is 2278891.

It can be written as a sum of positive squares in 2 ways, for example, as 1962801 + 25921 = 1401^2 + 161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1988729) 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 in 3 ways as a sum of consecutive naturals, for example, 8029 + ... + 8272.

2^1988722 is an apocalyptic number.

1988722 is a deficient number, since it is larger than the sum of its proper divisors (1043450).

1988722 is a wasteful number, since it uses less digits than its factorization.

1988722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16364.

The product of its digits is 16128, while the sum is 37.

The square root of 1988722 is about 1410.2205501268. The cubic root of 1988722 is about 125.7548352811.

The spelling of 1988722 in words is "one million, nine hundred eighty-eight thousand, seven hundred twenty-two".