857969999 has 2 divisors, whose sum is σ = 857970000. Its totient is φ = 857969998.

The previous prime is 857969939. The next prime is 857970049. The reversal of 857969999 is 999969758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857969999 - 2⁸ = 857969743 is a prime.

It is a super-2 number, since 2×857969999² = 1472225038368120002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857969939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428984999 + 428985000.

It is an arithmetic number, because the mean of its divisors is an integer number (428985000).

Almost surely, 2^857969999 is an apocalyptic number.

857969999 is a deficient number, since it is larger than the sum of its proper divisors (1).

857969999 is an equidigital number, since it uses as much as digits as its factorization.

857969999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99202320, while the sum is 71.

The square root of 857969999 is about 29291.1249186507. The cubic root of 857969999 is about 950.2197087403.

The spelling of 857969999 in words is "eight hundred fifty-seven million, nine hundred sixty-nine thousand, nine hundred ninety-nine".