1578779 has 2 divisors, whose sum is σ = 1578780. Its totient is φ = 1578778.

The previous prime is 1578769. The next prime is 1578793. The reversal of 1578779 is 9778751.

1578779 is nontrivially palindromic in base 5.

It is a weak prime.

It is an emirp because it is prime and its reverse (9778751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1578779 - 2²⁰ = 530203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1578719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 789389 + 789390.

It is an arithmetic number, because the mean of its divisors is an integer number (789390).

2^1578779 is an apocalyptic number.

1578779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1578779 is an equidigital number, since it uses as much as digits as its factorization.

1578779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 44.

The square root of 1578779 is about 1256.4947274064. The cubic root of 1578779 is about 116.4413182949.

The spelling of 1578779 in words is "one million, five hundred seventy-eight thousand, seven hundred seventy-nine".