1390009 has 4 divisors (see below), whose sum is σ = 1434880. Its totient is φ = 1345140.

The previous prime is 1390003. The next prime is 1390019. The reversal of 1390009 is 9000931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1390009 - 2¹¹ = 1387961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22389 + ... + 22450.

It is an arithmetic number, because the mean of its divisors is an integer number (358720).

2^1390009 is an apocalyptic number.

It is an amenable number.

1390009 is a deficient number, since it is larger than the sum of its proper divisors (44871).

1390009 is an equidigital number, since it uses as much as digits as its factorization.

1390009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44870.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 1390009 is about 1178.9864290992. The cubic root of 1390009 is about 111.6021438590.

The spelling of 1390009 in words is "one million, three hundred ninety thousand, nine".