1381838 has 4 divisors (see below), whose sum is σ = 2072760. Its totient is φ = 690918.

The previous prime is 1381837. The next prime is 1381859. The reversal of 1381838 is 8381831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381837) by changing a digit.

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 as a sum of consecutive naturals, namely, 345458 + ... + 345461.

It is an arithmetic number, because the mean of its divisors is an integer number (518190).

2^1381838 is an apocalyptic number.

1381838 is a deficient number, since it is larger than the sum of its proper divisors (690922).

1381838 is an equidigital number, since it uses as much as digits as its factorization.

1381838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690921.

The product of its digits is 4608, while the sum is 32.

The square root of 1381838 is about 1175.5160568874. The cubic root of 1381838 is about 111.3830340524.

The spelling of 1381838 in words is "one million, three hundred eighty-one thousand, eight hundred thirty-eight".