1381506 has 48 divisors (see below), whose sum is σ = 3326976. Its totient is φ = 381024.

The previous prime is 1381493. The next prime is 1381507. The reversal of 1381506 is 6051831.

It is not an unprimeable number, because it can be changed into a prime (1381507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10815 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (69312).

2^1381506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1663488).

1381506 is an abundant number, since it is smaller than the sum of its proper divisors (1945470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381506 is a wasteful number, since it uses less digits than its factorization.

1381506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1381506 is about 1175.3748338296. The cubic root of 1381506 is about 111.3741130527.

The spelling of 1381506 in words is "one million, three hundred eighty-one thousand, five hundred six".