1381903 has 4 divisors (see below), whose sum is σ = 1397520. Its totient is φ = 1366288.

The previous prime is 1381901. The next prime is 1381907. The reversal of 1381903 is 3091831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3091831 = 37 ⋅83563.

It is a cyclic number.

It is not a de Polignac number, because 1381903 - 2¹ = 1381901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381901) 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, 7675 + ... + 7852.

It is an arithmetic number, because the mean of its divisors is an integer number (349380).

2^1381903 is an apocalyptic number.

1381903 is a deficient number, since it is larger than the sum of its proper divisors (15617).

1381903 is an equidigital number, since it uses as much as digits as its factorization.

1381903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15616.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1381903 is about 1175.5437039940. The cubic root of 1381903 is about 111.3847804664.

The spelling of 1381903 in words is "one million, three hundred eighty-one thousand, nine hundred three".