1378986605 has 8 divisors (see below), whose sum is σ = 1655251200. Its totient is φ = 1102877776.

The previous prime is 1378986601. The next prime is 1378986611. The reversal of 1378986605 is 5066898731.

It is a happy number.

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 1378986605 - 2² = 1378986601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378986601) 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, 18485 + ... + 55674.

It is an arithmetic number, because the mean of its divisors is an integer number (206906400).

Almost surely, 2^1378986605 is an apocalyptic number.

It is an amenable number.

1378986605 is a deficient number, since it is larger than the sum of its proper divisors (276264595).

1378986605 is an equidigital number, since it uses as much as digits as its factorization.

1378986605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77883.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 1378986605 is about 37134.7088988186. The cubic root of 1378986605 is about 1113.0636907702.

The spelling of 1378986605 in words is "one billion, three hundred seventy-eight million, nine hundred eighty-six thousand, six hundred five".