814857921 has 32 divisors (see below), whose sum is σ = 1314576000. Its totient is φ = 496891584.

The previous prime is 814857913. The next prime is 814857943. The reversal of 814857921 is 129758418.

814857921 is a `hidden beast` number, since 81 + 485 + 7 + 92 + 1 = 666.

It is not a de Polignac number, because 814857921 - 2³ = 814857913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (814858921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12510 + ... + 42263.

It is an arithmetic number, because the mean of its divisors is an integer number (41080500).

Almost surely, 2^814857921 is an apocalyptic number.

It is an amenable number.

814857921 is a deficient number, since it is larger than the sum of its proper divisors (499718079).

814857921 is a wasteful number, since it uses less digits than its factorization.

814857921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54830 (or 54824 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 814857921 is about 28545.7163336288. The cubic root of 814857921 is about 934.0295806407.

The spelling of 814857921 in words is "eight hundred fourteen million, eight hundred fifty-seven thousand, nine hundred twenty-one".