851257838 has 16 divisors (see below), whose sum is σ = 1291353840. Its totient is φ = 420815616.

The previous prime is 851257831. The next prime is 851257859. The reversal of 851257838 is 838752158.

It is a junction number, because it is equal to n+sod(n) for n = 851257792 and 851257801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851257831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288173 + ... + 291111.

It is an arithmetic number, because the mean of its divisors is an integer number (80709615).

Almost surely, 2^851257838 is an apocalyptic number.

851257838 is a deficient number, since it is larger than the sum of its proper divisors (440096002).

851257838 is a wasteful number, since it uses less digits than its factorization.

851257838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531.

The product of its digits is 537600, while the sum is 47.

The square root of 851257838 is about 29176.3232433424. The cubic root of 851257838 is about 947.7352657082.

The spelling of 851257838 in words is "eight hundred fifty-one million, two hundred fifty-seven thousand, eight hundred thirty-eight".