919389 has 4 divisors (see below), whose sum is σ = 1225856. Its totient is φ = 612924.

The previous prime is 919381. The next prime is 919393. The reversal of 919389 is 983919.

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 not a de Polignac number, because 919389 - 2³ = 919381 is a prime.

It is a super-2 number, since 2×919389² = 1690552266642, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919381) 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, 153229 + ... + 153234.

It is an arithmetic number, because the mean of its divisors is an integer number (306464).

2⁹¹⁹³⁸⁹ is an apocalyptic number.

It is an amenable number.

919389 is a deficient number, since it is larger than the sum of its proper divisors (306467).

919389 is a wasteful number, since it uses less digits than its factorization.

919389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306466.

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

The square root of 919389 is about 958.8477459952. The cubic root of 919389 is about 97.2373469924.

The spelling of 919389 in words is "nine hundred nineteen thousand, three hundred eighty-nine".