1138909 has 4 divisors (see below), whose sum is σ = 1175680. Its totient is φ = 1102140.

The previous prime is 1138901. The next prime is 1138919. The reversal of 1138909 is 9098311.

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 1138909 - 2³ = 1138901 is a prime.

It is a super-2 number, since 2×1138909² = 2594227420562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 36739 = 1138909 / (1 + 1 + 3 + 8 + 9 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138901) 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, 18339 + ... + 18400.

It is an arithmetic number, because the mean of its divisors is an integer number (293920).

2^1138909 is an apocalyptic number.

It is an amenable number.

1138909 is a deficient number, since it is larger than the sum of its proper divisors (36771).

1138909 is an equidigital number, since it uses as much as digits as its factorization.

1138909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36770.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1138909 is about 1067.1967953475. The cubic root of 1138909 is about 104.4310572936.

The spelling of 1138909 in words is "one million, one hundred thirty-eight thousand, nine hundred nine".