1040389 has 4 divisors (see below), whose sum is σ = 1189024. Its totient is φ = 891756.

The previous prime is 1040387. The next prime is 1040407. The reversal of 1040389 is 9830401.

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 1040389 - 2¹ = 1040387 is a prime.

It is a Duffinian number.

1040389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040381) 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, 74307 + ... + 74320.

It is an arithmetic number, because the mean of its divisors is an integer number (297256).

2^1040389 is an apocalyptic number.

It is an amenable number.

1040389 is a deficient number, since it is larger than the sum of its proper divisors (148635).

1040389 is an equidigital number, since it uses as much as digits as its factorization.

1040389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148634.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1040389 is about 1019.9946078289. The cubic root of 1040389 is about 101.3285708269.

The spelling of 1040389 in words is "one million, forty thousand, three hundred eighty-nine".