1427978857 has 2 divisors, whose sum is σ = 1427978858. Its totient is φ = 1427978856.

The previous prime is 1427978843. The next prime is 1427978861. The reversal of 1427978857 is 7588797241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1246160601 + 181818256 = 35301^2 + 13484^2 .

It is a cyclic number.

It is not a de Polignac number, because 1427978857 - 2¹⁵ = 1427946089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1427978887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713989428 + 713989429.

It is an arithmetic number, because the mean of its divisors is an integer number (713989429).

Almost surely, 2^1427978857 is an apocalyptic number.

It is an amenable number.

1427978857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427978857 is an equidigital number, since it uses as much as digits as its factorization.

1427978857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7902720, while the sum is 58.

The square root of 1427978857 is about 37788.6075027911. The cubic root of 1427978857 is about 1126.0921363296.

The spelling of 1427978857 in words is "one billion, four hundred twenty-seven million, nine hundred seventy-eight thousand, eight hundred fifty-seven".