857214197 has 4 divisors (see below), whose sum is σ = 979673376. Its totient is φ = 734755020.

The previous prime is 857214181. The next prime is 857214221. The reversal of 857214197 is 791412758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 857214197 - 2⁴ = 857214181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857214157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61229579 + ... + 61229592.

It is an arithmetic number, because the mean of its divisors is an integer number (244918344).

Almost surely, 2^857214197 is an apocalyptic number.

It is an amenable number.

857214197 is a deficient number, since it is larger than the sum of its proper divisors (122459179).

857214197 is a wasteful number, since it uses less digits than its factorization.

857214197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122459178.

The product of its digits is 141120, while the sum is 44.

The square root of 857214197 is about 29278.2205231124. The cubic root of 857214197 is about 949.9406045968.

The spelling of 857214197 in words is "eight hundred fifty-seven million, two hundred fourteen thousand, one hundred ninety-seven".