1006138789 has 4 divisors (see below), whose sum is σ = 1040833260. Its totient is φ = 971444320.

The previous prime is 1006138769. The next prime is 1006138801. The reversal of 1006138789 is 9878316001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9878316001 = 4409 ⋅2240489.

It can be written as a sum of positive squares in 2 ways, for example, as 167573025 + 838565764 = 12945^2 + 28958^2 .

It is not a de Polignac number, because 1006138789 - 2⁹ = 1006138277 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 (1006138769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17347192 + ... + 17347249.

It is an arithmetic number, because the mean of its divisors is an integer number (260208315).

Almost surely, 2^1006138789 is an apocalyptic number.

It is an amenable number.

1006138789 is a deficient number, since it is larger than the sum of its proper divisors (34694471).

1006138789 is an equidigital number, since it uses as much as digits as its factorization.

1006138789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34694470.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1006138789 is about 31719.6908717598. The cubic root of 1006138789 is about 1002.0420900297.

The spelling of 1006138789 in words is "one billion, six million, one hundred thirty-eight thousand, seven hundred eighty-nine".