780813427 has 2 divisors, whose sum is σ = 780813428. Its totient is φ = 780813426.

The previous prime is 780813403. The next prime is 780813433. The reversal of 780813427 is 724318087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780813427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 780813427.

It is not a weakly prime, because it can be changed into another prime (780814427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390406713 + 390406714.

It is an arithmetic number, because the mean of its divisors is an integer number (390406714).

Almost surely, 2^780813427 is an apocalyptic number.

780813427 is a deficient number, since it is larger than the sum of its proper divisors (1).

780813427 is an equidigital number, since it uses as much as digits as its factorization.

780813427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 780813427 is about 27943.0389721662. The cubic root of 780813427 is about 920.8362855011.

The spelling of 780813427 in words is "seven hundred eighty million, eight hundred thirteen thousand, four hundred twenty-seven".