1390209609 has 8 divisors (see below), whose sum is σ = 1854889120. Its totient is φ = 926168256.

The previous prime is 1390209593. The next prime is 1390209617. The reversal of 1390209609 is 9069020931.

It is a happy number.

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

It is not a de Polignac number, because 1390209609 - 2⁴ = 1390209593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390209659) 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, 154432 + ... + 163185.

It is an arithmetic number, because the mean of its divisors is an integer number (231861140).

Almost surely, 2^1390209609 is an apocalyptic number.

It is an amenable number.

1390209609 is a deficient number, since it is larger than the sum of its proper divisors (464679511).

1390209609 is a wasteful number, since it uses less digits than its factorization.

1390209609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319079.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 1390209609 is about 37285.5147342772. The cubic root of 1390209609 is about 1116.0751248550.

The spelling of 1390209609 in words is "one billion, three hundred ninety million, two hundred nine thousand, six hundred nine".