1381626 has 12 divisors (see below), whose sum is σ = 2993562. Its totient is φ = 460536.

The previous prime is 1381621. The next prime is 1381637. The reversal of 1381626 is 6261831.

1381626 is a `hidden beast` number, since 1 + 38 + 1 + 626 = 666.

1381626 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 488601 = 945^2 + 699^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1381626.

It is not an unprimeable number, because it can be changed into a prime (1381621) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 38361 + ... + 38396.

2^1381626 is an apocalyptic number.

1381626 is an abundant number, since it is smaller than the sum of its proper divisors (1611936).

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

1381626 is a wasteful number, since it uses less digits than its factorization.

1381626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76765 (or 76762 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1381626 is about 1175.4258802664. The cubic root of 1381626 is about 111.3773376754.

It can be divided in two parts, 138 and 1626, that added together give a square (1764 = 42²).

The spelling of 1381626 in words is "one million, three hundred eighty-one thousand, six hundred twenty-six".