857520819 has 12 divisors (see below), whose sum is σ = 1240317936. Its totient is φ = 570906672.

The previous prime is 857520751. The next prime is 857520827. The reversal of 857520819 is 918025758.

It is a happy number.

It is not a de Polignac number, because 857520819 - 2¹³ = 857512627 is a prime.

It is a super-2 number, since 2×857520819² = 1470683910036861522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (857520869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57432 + ... + 70805.

It is an arithmetic number, because the mean of its divisors is an integer number (103359828).

Almost surely, 2^857520819 is an apocalyptic number.

857520819 is a deficient number, since it is larger than the sum of its proper divisors (382797117).

857520819 is a wasteful number, since it uses less digits than its factorization.

857520819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128986 (or 128983 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 857520819 is about 29283.4564045981. The cubic root of 857520819 is about 950.0538543801.

The spelling of 857520819 in words is "eight hundred fifty-seven million, five hundred twenty thousand, eight hundred nineteen".