1389770 has 8 divisors (see below), whose sum is σ = 2501604. Its totient is φ = 555904.

The previous prime is 1389769. The next prime is 1389797. The reversal of 1389770 is 779831.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 247009 = 1069^2 + 497^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1389770.

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, 69479 + ... + 69498.

2^1389770 is an apocalyptic number.

1389770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1389770 is a deficient number, since it is larger than the sum of its proper divisors (1111834).

1389770 is a wasteful number, since it uses less digits than its factorization.

1389770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138984.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 1389770 is about 1178.8850664929. The cubic root of 1389770 is about 111.5957471519.

The spelling of 1389770 in words is "one million, three hundred eighty-nine thousand, seven hundred seventy".