197438857 has 16 divisors (see below), whose sum is σ = 247824000. Its totient is φ = 152807040.

The previous prime is 197438851. The next prime is 197438863. The reversal of 197438857 is 758834791.

197438857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (197438851) and next prime (197438863).

It is a cyclic number.

It is not a de Polignac number, because 197438857 - 2⁷ = 197438729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197438851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2869 + ... + 20077.

It is an arithmetic number, because the mean of its divisors is an integer number (15489000).

Almost surely, 2^197438857 is an apocalyptic number.

197438857 is the 11473-rd pentagonal number.

It is an amenable number.

197438857 is a deficient number, since it is larger than the sum of its proper divisors (50385143).

197438857 is a wasteful number, since it uses less digits than its factorization.

197438857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17376.

The product of its digits is 1693440, while the sum is 52.

The square root of 197438857 is about 14051.2937838478. The cubic root of 197438857 is about 582.2965397963.

The spelling of 197438857 in words is "one hundred ninety-seven million, four hundred thirty-eight thousand, eight hundred fifty-seven".