1389506 has 8 divisors (see below), whose sum is σ = 2156220. Its totient is φ = 670768.

The previous prime is 1389491. The next prime is 1389511. The reversal of 1389506 is 6059831.

It can be written as a sum of positive squares in 2 ways, for example, as 1343281 + 46225 = 1159^2 + 215^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11921 + ... + 12036.

2^1389506 is an apocalyptic number.

1389506 is a deficient number, since it is larger than the sum of its proper divisors (766714).

1389506 is a wasteful number, since it uses less digits than its factorization.

1389506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23988.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1389506 is about 1178.7730909721. The cubic root of 1389506 is about 111.5886804807.

The spelling of 1389506 in words is "one million, three hundred eighty-nine thousand, five hundred six".