1381646 has 8 divisors (see below), whose sum is σ = 2368560. Its totient is φ = 592128.

The previous prime is 1381643. The next prime is 1381649. The reversal of 1381646 is 6461831.

It is an interprime number because it is at equal distance from previous prime (1381643) and next prime (1381649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381643) 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, 49331 + ... + 49358.

It is an arithmetic number, because the mean of its divisors is an integer number (296070).

2^1381646 is an apocalyptic number.

1381646 is a deficient number, since it is larger than the sum of its proper divisors (986914).

1381646 is an equidigital number, since it uses as much as digits as its factorization.

1381646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98698.

The product of its digits is 3456, while the sum is 29.

The square root of 1381646 is about 1175.4343877903. The cubic root of 1381646 is about 111.3778750943.

It can be divided in two parts, 13816 and 46, that multiplied together give a palindrome (635536).

The spelling of 1381646 in words is "one million, three hundred eighty-one thousand, six hundred forty-six".