1386631 has 2 divisors, whose sum is σ = 1386632. Its totient is φ = 1386630.

The previous prime is 1386617. The next prime is 1386643. The reversal of 1386631 is 1366831.

It is a strong prime.

It is an emirp because it is prime and its reverse (1366831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1386631 - 2¹³ = 1378439 is a prime.

It is a super-2 number, since 2×1386631² = 3845491060322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1386631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1386611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693315 + 693316.

It is an arithmetic number, because the mean of its divisors is an integer number (693316).

2^1386631 is an apocalyptic number.

1386631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386631 is an equidigital number, since it uses as much as digits as its factorization.

1386631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1386631 is about 1177.5529712077. The cubic root of 1386631 is about 111.5116653456.

The spelling of 1386631 in words is "one million, three hundred eighty-six thousand, six hundred thirty-one".