1381399 has 4 divisors (see below), whose sum is σ = 1386664. Its totient is φ = 1376136.

The previous prime is 1381397. The next prime is 1381409. The reversal of 1381399 is 9931831.

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

It is not a de Polignac number, because 1381399 - 2¹ = 1381397 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381397) 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, 2217 + ... + 2770.

It is an arithmetic number, because the mean of its divisors is an integer number (346666).

2^1381399 is an apocalyptic number.

1381399 is a deficient number, since it is larger than the sum of its proper divisors (5265).

1381399 is an equidigital number, since it uses as much as digits as its factorization.

1381399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264.

The product of its digits is 5832, while the sum is 34.

The square root of 1381399 is about 1175.3293155537. The cubic root of 1381399 is about 111.3712376067.

The spelling of 1381399 in words is "one million, three hundred eighty-one thousand, three hundred ninety-nine".