1381851 has 12 divisors (see below), whose sum is σ = 2101320. Its totient is φ = 872640.

The previous prime is 1381837. The next prime is 1381859. The reversal of 1381851 is 1581831.

It is not a de Polignac number, because 1381851 - 2⁵ = 1381819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1381859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3870 + ... + 4211.

It is an arithmetic number, because the mean of its divisors is an integer number (175110).

2^1381851 is an apocalyptic number.

1381851 is a deficient number, since it is larger than the sum of its proper divisors (719469).

1381851 is a wasteful number, since it uses less digits than its factorization.

1381851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106 (or 8103 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 1381851 is about 1175.5215863607. The cubic root of 1381851 is about 111.3833833396.

The spelling of 1381851 in words is "one million, three hundred eighty-one thousand, eight hundred fifty-one".