915839989 has 4 divisors (see below), whose sum is σ = 920442400. Its totient is φ = 911237580.

The previous prime is 915839987. The next prime is 915839999. The reversal of 915839989 is 989938519.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 915839989 - 2¹ = 915839987 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 (915839987) 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, 2300907 + ... + 2301304.

It is an arithmetic number, because the mean of its divisors is an integer number (230110600).

Almost surely, 2^915839989 is an apocalyptic number.

It is an amenable number.

915839989 is a deficient number, since it is larger than the sum of its proper divisors (4602411).

915839989 is a wasteful number, since it uses less digits than its factorization.

915839989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602410.

The product of its digits is 6298560, while the sum is 61.

The square root of 915839989 is about 30262.8483292634. The cubic root of 915839989 is about 971.1206762600.

The spelling of 915839989 in words is "nine hundred fifteen million, eight hundred thirty-nine thousand, nine hundred eighty-nine".