1138506 has 16 divisors (see below), whose sum is σ = 2350848. Its totient is φ = 367200.

The previous prime is 1138483. The next prime is 1138519. The reversal of 1138506 is 6058311.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2875 + ... + 3246.

It is an arithmetic number, because the mean of its divisors is an integer number (146928).

2^1138506 is an apocalyptic number.

1138506 is an abundant number, since it is smaller than the sum of its proper divisors (1212342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1138506 is a wasteful number, since it uses less digits than its factorization.

1138506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6157.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1138506 is about 1067.0079662308. The cubic root of 1138506 is about 104.4187382874.

Subtracting from 1138506 its product of nonzero digits (720), we obtain a triangular number (1137786 = T₁₅₀₈).

The spelling of 1138506 in words is "one million, one hundred thirty-eight thousand, five hundred six".