1380640279 has 2 divisors, whose sum is σ = 1380640280. Its totient is φ = 1380640278.

The previous prime is 1380640271. The next prime is 1380640333. The reversal of 1380640279 is 9720460831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1380640279 - 2³ = 1380640271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380640271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690320139 + 690320140.

It is an arithmetic number, because the mean of its divisors is an integer number (690320140).

Almost surely, 2^1380640279 is an apocalyptic number.

1380640279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380640279 is an equidigital number, since it uses as much as digits as its factorization.

1380640279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1380640279 is about 37156.9681082835. The cubic root of 1380640279 is about 1113.5084398840.

The spelling of 1380640279 in words is "one billion, three hundred eighty million, six hundred forty thousand, two hundred seventy-nine".