1838378 has 4 divisors (see below), whose sum is σ = 2757570. Its totient is φ = 919188.

The previous prime is 1838377. The next prime is 1838401. The reversal of 1838378 is 8738381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8738381 = 47 ⋅185923.

It can be written as a sum of positive squares in only one way, i.e., 1352569 + 485809 = 1163^2 + 697^2 .

It is not an unprimeable number, because it can be changed into a prime (1838371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459593 + ... + 459596.

2^1838378 is an apocalyptic number.

1838378 is a deficient number, since it is larger than the sum of its proper divisors (919192).

1838378 is an equidigital number, since it uses as much as digits as its factorization.

1838378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919191.

The product of its digits is 32256, while the sum is 38.

The square root of 1838378 is about 1355.8679876743. The cubic root of 1838378 is about 122.5024961313.

The spelling of 1838378 in words is "one million, eight hundred thirty-eight thousand, three hundred seventy-eight".