1742397989 has 4 divisors (see below), whose sum is σ = 1742492556. Its totient is φ = 1742303424.

The previous prime is 1742397967. The next prime is 1742397991. The reversal of 1742397989 is 9897932471.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1323868225 + 418529764 = 36385^2 + 20458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1742397989 - 2¹⁶ = 1742332453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1742397089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9674 + ... + 59819.

It is an arithmetic number, because the mean of its divisors is an integer number (435623139).

Almost surely, 2^1742397989 is an apocalyptic number.

It is an amenable number.

1742397989 is a deficient number, since it is larger than the sum of its proper divisors (94567).

1742397989 is an equidigital number, since it uses as much as digits as its factorization.

1742397989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94566.

The product of its digits is 6858432, while the sum is 59.

The square root of 1742397989 is about 41742.0410258051. The cubic root of 1742397989 is about 1203.3236537632.

The spelling of 1742397989 in words is "one billion, seven hundred forty-two million, three hundred ninety-seven thousand, nine hundred eighty-nine".