197407857 has 4 divisors (see below), whose sum is σ = 263210480. Its totient is φ = 131605236.

The previous prime is 197407811. The next prime is 197407867. The reversal of 197407857 is 758704791.

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 not a de Polignac number, because 197407857 - 2¹² = 197403761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197407867) 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 3 ways as a sum of consecutive naturals, for example, 32901307 + ... + 32901312.

It is an arithmetic number, because the mean of its divisors is an integer number (65802620).

Almost surely, 2^197407857 is an apocalyptic number.

It is an amenable number.

197407857 is a deficient number, since it is larger than the sum of its proper divisors (65802623).

197407857 is an equidigital number, since it uses as much as digits as its factorization.

197407857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65802622.

The product of its (nonzero) digits is 493920, while the sum is 48.

The square root of 197407857 is about 14050.1906392760. The cubic root of 197407857 is about 582.2660626184.

The spelling of 197407857 in words is "one hundred ninety-seven million, four hundred seven thousand, eight hundred fifty-seven".