1389636 has 30 divisors (see below), whose sum is σ = 3633630. Its totient is φ = 463104.

The previous prime is 1389629. The next prime is 1389643. The reversal of 1389636 is 6369831.

It is a happy number.

1389636 is a `hidden beast` number, since 13 + 8 + 9 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (1389629) and next prime (1389643).

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 20736 = 1170^2 + 144^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1389636.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1821 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (121121).

2^1389636 is an apocalyptic number.

It is an amenable number.

1389636 is an abundant number, since it is smaller than the sum of its proper divisors (2243994).

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

1389636 is a wasteful number, since it uses less digits than its factorization.

1389636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305 (or 4294 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1389636 is about 1178.8282317624. The cubic root of 1389636 is about 111.5921603928.

It can be divided in two parts, 1389 and 636, that added together give a square (2025 = 45²).

The spelling of 1389636 in words is "one million, three hundred eighty-nine thousand, six hundred thirty-six".