197689478 has 8 divisors (see below), whose sum is σ = 338896272. Its totient is φ = 84724056.

The previous prime is 197689477. The next prime is 197689501. The reversal of 197689478 is 874986791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×197689478² = 78162259423824968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197689477) 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, 7060325 + ... + 7060352.

It is an arithmetic number, because the mean of its divisors is an integer number (42362034).

Almost surely, 2^197689478 is an apocalyptic number.

197689478 is a deficient number, since it is larger than the sum of its proper divisors (141206794).

197689478 is a wasteful number, since it uses less digits than its factorization.

197689478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14120686.

The product of its digits is 6096384, while the sum is 59.

The square root of 197689478 is about 14060.2090311631. The cubic root of 197689478 is about 582.5428169451.

The spelling of 197689478 in words is "one hundred ninety-seven million, six hundred eighty-nine thousand, four hundred seventy-eight".