1381566 has 16 divisors (see below), whose sum is σ = 2908800. Its totient is φ = 436248.

The previous prime is 1381559. The next prime is 1381609. The reversal of 1381566 is 6651831.

It is a super-2 number, since 2×1381566² = 3817449224712, which contains 22 as substring.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 5946 + ... + 6173.

It is an arithmetic number, because the mean of its divisors is an integer number (181800).

2^1381566 is an apocalyptic number.

1381566 is an abundant number, since it is smaller than the sum of its proper divisors (1527234).

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

1381566 is a wasteful number, since it uses less digits than its factorization.

1381566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12143.

The product of its digits is 4320, while the sum is 30.

The square root of 1381566 is about 1175.4003573251. The cubic root of 1381566 is about 111.3757253874.

The spelling of 1381566 in words is "one million, three hundred eighty-one thousand, five hundred sixty-six".