427139257 has 2 divisors, whose sum is σ = 427139258. Its totient is φ = 427139256.

The previous prime is 427139239. The next prime is 427139269. The reversal of 427139257 is 752931724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423371776 + 3767481 = 20576^2 + 1941^2 .

It is a cyclic number.

It is not a de Polignac number, because 427139257 - 2⁷ = 427139129 is a prime.

It is not a weakly prime, because it can be changed into another prime (427139357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213569628 + 213569629.

It is an arithmetic number, because the mean of its divisors is an integer number (213569629).

Almost surely, 2^427139257 is an apocalyptic number.

It is an amenable number.

427139257 is a deficient number, since it is larger than the sum of its proper divisors (1).

427139257 is an equidigital number, since it uses as much as digits as its factorization.

427139257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 427139257 is about 20667.3476043734. The cubic root of 427139257 is about 753.1066733762.

The spelling of 427139257 in words is "four hundred twenty-seven million, one hundred thirty-nine thousand, two hundred fifty-seven".