1738139989 has 2 divisors, whose sum is σ = 1738139990. Its totient is φ = 1738139988.

The previous prime is 1738139987. The next prime is 1738140017. The reversal of 1738139989 is 9899318371.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1712718225 + 25421764 = 41385^2 + 5042^2 .

It is a cyclic number.

It is not a de Polignac number, because 1738139989 - 2¹ = 1738139987 is a prime.

It is a super-2 number, since 2×1738139989² = 6042261242721840242, which contains 22 as substring.

Together with 1738139987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1738139987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 869069994 + 869069995.

It is an arithmetic number, because the mean of its divisors is an integer number (869069995).

Almost surely, 2^1738139989 is an apocalyptic number.

It is an amenable number.

1738139989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1738139989 is an equidigital number, since it uses as much as digits as its factorization.

1738139989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 1738139989 is about 41691.0060924416. The cubic root of 1738139989 is about 1202.3426433849.

The spelling of 1738139989 in words is "one billion, seven hundred thirty-eight million, one hundred thirty-nine thousand, nine hundred eighty-nine".