1390209 has 8 divisors (see below), whose sum is σ = 1962720. Its totient is φ = 872256.

The previous prime is 1390199. The next prime is 1390219. The reversal of 1390209 is 9020931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1390199) and next prime (1390219).

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

It is not a de Polignac number, because 1390209 - 2⁵ = 1390177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1390219) 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, 13579 + ... + 13680.

It is an arithmetic number, because the mean of its divisors is an integer number (245340).

2^1390209 is an apocalyptic number.

It is an amenable number.

1390209 is a deficient number, since it is larger than the sum of its proper divisors (572511).

1390209 is a wasteful number, since it uses less digits than its factorization.

1390209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27279.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 1390209 is about 1179.0712446668. The cubic root of 1390209 is about 111.6074961884.

The spelling of 1390209 in words is "one million, three hundred ninety thousand, two hundred nine".