1381438 has 4 divisors (see below), whose sum is σ = 2072160. Its totient is φ = 690718.

The previous prime is 1381427. The next prime is 1381439. The reversal of 1381438 is 8341831.

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 (1381439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345358 + ... + 345361.

It is an arithmetic number, because the mean of its divisors is an integer number (518040).

2^1381438 is an apocalyptic number.

1381438 is a deficient number, since it is larger than the sum of its proper divisors (690722).

1381438 is an equidigital number, since it uses as much as digits as its factorization.

1381438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690721.

The product of its digits is 2304, while the sum is 28.

The square root of 1381438 is about 1175.3459065313. The cubic root of 1381438 is about 111.3722856836.

The spelling of 1381438 in words is "one million, three hundred eighty-one thousand, four hundred thirty-eight".