1838638 has 4 divisors (see below), whose sum is σ = 2757960. Its totient is φ = 919318.

The previous prime is 1838621. The next prime is 1838659. The reversal of 1838638 is 8368381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8368381 = 7 ⋅1195483.

It is a junction number, because it is equal to n+sod(n) for n = 1838597 and 1838606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459658 + ... + 459661.

It is an arithmetic number, because the mean of its divisors is an integer number (689490).

2^1838638 is an apocalyptic number.

1838638 is a deficient number, since it is larger than the sum of its proper divisors (919322).

1838638 is an equidigital number, since it uses as much as digits as its factorization.

1838638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919321.

The product of its digits is 27648, while the sum is 37.

The square root of 1838638 is about 1355.9638638253. The cubic root of 1838638 is about 122.5082709951.

The spelling of 1838638 in words is "one million, eight hundred thirty-eight thousand, six hundred thirty-eight".