1386638 has 8 divisors (see below), whose sum is σ = 2269080. Its totient is φ = 630280.

The previous prime is 1386631. The next prime is 1386643. The reversal of 1386638 is 8366831.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1386598 and 1386607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386631) 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, 31493 + ... + 31536.

It is an arithmetic number, because the mean of its divisors is an integer number (283635).

2^1386638 is an apocalyptic number.

1386638 is a deficient number, since it is larger than the sum of its proper divisors (882442).

1386638 is a wasteful number, since it uses less digits than its factorization.

1386638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63042.

The product of its digits is 20736, while the sum is 35.

The square root of 1386638 is about 1177.5559434694. Note that the first 3 decimals coincide. The cubic root of 1386638 is about 111.5118529900.

It can be divided in two parts, 138 and 6638, that added together give a palindrome (6776).

The spelling of 1386638 in words is "one million, three hundred eighty-six thousand, six hundred thirty-eight".