629427857 has 2 divisors, whose sum is σ = 629427858. Its totient is φ = 629427856.

The previous prime is 629427853. The next prime is 629427881. The reversal of 629427857 is 758724926.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419061841 + 210366016 = 20471^2 + 14504^2 .

It is a cyclic number.

It is not a de Polignac number, because 629427857 - 2² = 629427853 is a prime.

It is a super-2 number, since 2×629427857² = 792358854335224898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (629427853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314713928 + 314713929.

It is an arithmetic number, because the mean of its divisors is an integer number (314713929).

Almost surely, 2^629427857 is an apocalyptic number.

It is an amenable number.

629427857 is a deficient number, since it is larger than the sum of its proper divisors (1).

629427857 is an equidigital number, since it uses as much as digits as its factorization.

629427857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 50.

The square root of 629427857 is about 25088.4008458092. The cubic root of 629427857 is about 857.0022983154.

The spelling of 629427857 in words is "six hundred twenty-nine million, four hundred twenty-seven thousand, eight hundred fifty-seven".