913989 has 4 divisors (see below), whose sum is σ = 1218656. Its totient is φ = 609324.

The previous prime is 913981. The next prime is 913999. The reversal of 913989 is 989319.

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, and also an emirpimes, since its reverse is a distinct semiprime: 989319 = 3 ⋅329773.

It is not a de Polignac number, because 913989 - 2³ = 913981 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 913989.

It is not an unprimeable number, because it can be changed into a prime (913981) 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, 152329 + ... + 152334.

It is an arithmetic number, because the mean of its divisors is an integer number (304664).

2⁹¹³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

913989 is a deficient number, since it is larger than the sum of its proper divisors (304667).

913989 is a wasteful number, since it uses less digits than its factorization.

913989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304666.

The product of its digits is 17496, while the sum is 39.

The square root of 913989 is about 956.0277192634. The cubic root of 913989 is about 97.0465996381.

The spelling of 913989 in words is "nine hundred thirteen thousand, nine hundred eighty-nine".