1389986 has 16 divisors (see below), whose sum is σ = 2265144. Its totient is φ = 635904.

The previous prime is 1389961. The next prime is 1389989. The reversal of 1389986 is 6899831.

It can be written as a sum of positive squares in 4 ways, for example, as 534361 + 855625 = 731^2 + 925^2 .

It is a super-2 number, since 2×1389986² = 3864122160392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1389989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4880 + ... + 5156.

2^1389986 is an apocalyptic number.

1389986 is a deficient number, since it is larger than the sum of its proper divisors (875158).

1389986 is a wasteful number, since it uses less digits than its factorization.

1389986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485.

The product of its digits is 93312, while the sum is 44.

The square root of 1389986 is about 1178.9766749177. The cubic root of 1389986 is about 111.6015283082.

The spelling of 1389986 in words is "one million, three hundred eighty-nine thousand, nine hundred eighty-six".