857857438 has 8 divisors (see below), whose sum is σ = 1299526920. Its totient is φ = 424681800.

The previous prime is 857857411. The next prime is 857857447. The reversal of 857857438 is 834758758.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2123208 + ... + 2123611.

It is an arithmetic number, because the mean of its divisors is an integer number (162440865).

Almost surely, 2^857857438 is an apocalyptic number.

857857438 is a deficient number, since it is larger than the sum of its proper divisors (441669482).

857857438 is a wasteful number, since it uses less digits than its factorization.

857857438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246922.

The product of its digits is 7526400, while the sum is 55.

The square root of 857857438 is about 29289.2034374443. The cubic root of 857857438 is about 950.1781523694.

The spelling of 857857438 in words is "eight hundred fifty-seven million, eight hundred fifty-seven thousand, four hundred thirty-eight".