1381845 has 16 divisors (see below), whose sum is σ = 2341440. Its totient is φ = 693504.

The previous prime is 1381837. The next prime is 1381859. The reversal of 1381845 is 5481831.

It is not a de Polignac number, because 1381845 - 2³ = 1381837 is a prime.

1381845 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 2455 + ... + 2964.

It is an arithmetic number, because the mean of its divisors is an integer number (146340).

2^1381845 is an apocalyptic number.

1381845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381845 is a deficient number, since it is larger than the sum of its proper divisors (959595).

1381845 is a wasteful number, since it uses less digits than its factorization.

1381845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444.

The product of its digits is 3840, while the sum is 30.

The square root of 1381845 is about 1175.5190342993. The cubic root of 1381845 is about 111.3832221304.

The spelling of 1381845 in words is "one million, three hundred eighty-one thousand, eight hundred forty-five".