857641477 has 16 divisors (see below), whose sum is σ = 1092022272. Its totient is φ = 654070320.

The previous prime is 857641471. The next prime is 857641481. The reversal of 857641477 is 774146758.

It is a cyclic number.

It is not a de Polignac number, because 857641477 - 2¹⁵ = 857608709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 857641477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857641471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114873 + ... + 122110.

It is an arithmetic number, because the mean of its divisors is an integer number (68251392).

Almost surely, 2^857641477 is an apocalyptic number.

It is an amenable number.

857641477 is a deficient number, since it is larger than the sum of its proper divisors (234380795).

857641477 is a wasteful number, since it uses less digits than its factorization.

857641477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237048.

The product of its digits is 1317120, while the sum is 49.

The square root of 857641477 is about 29285.5165056039. The cubic root of 857641477 is about 950.0984115964.

The spelling of 857641477 in words is "eight hundred fifty-seven million, six hundred forty-one thousand, four hundred seventy-seven".