1389866 has 8 divisors (see below), whose sum is σ = 2091204. Its totient is φ = 692800.

The previous prime is 1389853. The next prime is 1389877. The reversal of 1389866 is 6689831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1256641 + 133225 = 1121^2 + 365^2 .

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

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, 65 + ... + 1668.

2^1389866 is an apocalyptic number.

1389866 is a deficient number, since it is larger than the sum of its proper divisors (701338).

1389866 is a wasteful number, since it uses less digits than its factorization.

1389866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136.

The product of its digits is 62208, while the sum is 41.

The square root of 1389866 is about 1178.9257822272. The cubic root of 1389866 is about 111.5983166286.

The spelling of 1389866 in words is "one million, three hundred eighty-nine thousand, eight hundred sixty-six".