1380779 has 2 divisors, whose sum is σ = 1380780. Its totient is φ = 1380778.

The previous prime is 1380763. The next prime is 1380781. The reversal of 1380779 is 9770831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1380779 - 2⁴ = 1380763 is a prime.

It is a Sophie Germain prime.

Together with 1380781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1380679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690389 + 690390.

It is an arithmetic number, because the mean of its divisors is an integer number (690390).

2^1380779 is an apocalyptic number.

1380779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380779 is an equidigital number, since it uses as much as digits as its factorization.

1380779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 1380779 is about 1175.0655300876. The cubic root of 1380779 is about 111.3545732203.

The spelling of 1380779 in words is "one million, three hundred eighty thousand, seven hundred seventy-nine".