1011389 has 4 divisors (see below), whose sum is σ = 1064640. Its totient is φ = 958140.

The previous prime is 1011377. The next prime is 1011391. The reversal of 1011389 is 9831101.

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 a de Polignac number, because none of the positive numbers 2^k-1011389 is a prime.

It is an Ulam 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 (1011349) 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, 26597 + ... + 26634.

It is an arithmetic number, because the mean of its divisors is an integer number (266160).

2^1011389 is an apocalyptic number.

1011389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1011389 is a deficient number, since it is larger than the sum of its proper divisors (53251).

1011389 is an equidigital number, since it uses as much as digits as its factorization.

1011389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53250.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1011389 is about 1005.6783780116. The cubic root of 1011389 is about 100.3782011689.

The spelling of 1011389 in words is "one million, eleven thousand, three hundred eighty-nine".