1380609985 has 8 divisors (see below), whose sum is σ = 1687991400. Its totient is φ = 1083648384.

The previous prime is 1380609953. The next prime is 1380609991. The reversal of 1380609985 is 5899060831.

It can be written as a sum of positive squares in 4 ways, for example, as 685549489 + 695060496 = 26183^2 + 26364^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1380609985 - 2⁵ = 1380609953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2604660 + ... + 2605189.

It is an arithmetic number, because the mean of its divisors is an integer number (210998925).

Almost surely, 2^1380609985 is an apocalyptic number.

It is an amenable number.

1380609985 is a deficient number, since it is larger than the sum of its proper divisors (307381415).

1380609985 is an equidigital number, since it uses as much as digits as its factorization.

1380609985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209907.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 1380609985 is about 37156.5604570714. The cubic root of 1380609985 is about 1113.5002956261.

The spelling of 1380609985 in words is "one billion, three hundred eighty million, six hundred nine thousand, nine hundred eighty-five".