1838139 has 4 divisors (see below), whose sum is σ = 2450856. Its totient is φ = 1225424.

The previous prime is 1838131. The next prime is 1838141. The reversal of 1838139 is 9318381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1838139 - 2³ = 1838131 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1838131) 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, 306354 + ... + 306359.

It is an arithmetic number, because the mean of its divisors is an integer number (612714).

2^1838139 is an apocalyptic number.

1838139 is a deficient number, since it is larger than the sum of its proper divisors (612717).

1838139 is an equidigital number, since it uses as much as digits as its factorization.

1838139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612716.

The product of its digits is 5184, while the sum is 33.

The square root of 1838139 is about 1355.7798493856. The cubic root of 1838139 is about 122.4971872185.

The spelling of 1838139 in words is "one million, eight hundred thirty-eight thousand, one hundred thirty-nine".