920389 has 4 divisors (see below), whose sum is σ = 924480. Its totient is φ = 916300.

The previous prime is 920377. The next prime is 920393. The reversal of 920389 is 983029.

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, and also an emirpimes, since its reverse is a distinct semiprime: 983029 = 337 ⋅2917.

It is a cyclic number.

It is not a de Polignac number, because 920389 - 2⁵ = 920357 is a prime.

It is a super-2 number, since 2×920389² = 1694231822642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 920389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (231120).

2⁹²⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

920389 is a deficient number, since it is larger than the sum of its proper divisors (4091).

920389 is a wasteful number, since it uses less digits than its factorization.

920389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 920389 is about 959.3690634995. The cubic root of 920389 is about 97.2725885546.

The spelling of 920389 in words is "nine hundred twenty thousand, three hundred eighty-nine".