1381816 has 16 divisors (see below), whose sum is σ = 2640600. Its totient is φ = 677664.

The previous prime is 1381769. The next prime is 1381819. The reversal of 1381816 is 6181831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381819) 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, 1206 + ... + 2053.

2^1381816 is an apocalyptic number.

It is an amenable number.

1381816 is a deficient number, since it is larger than the sum of its proper divisors (1258784).

1381816 is a wasteful number, since it uses less digits than its factorization.

1381816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3314 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 1381816 is about 1175.5066992578. The cubic root of 1381816 is about 111.3824429460.

It can be divided in two parts, 1381 and 816, that added together give a cube (2197 = 13³).

The spelling of 1381816 in words is "one million, three hundred eighty-one thousand, eight hundred sixteen".