197813918 has 4 divisors (see below), whose sum is σ = 296720880. Its totient is φ = 98906958.

The previous prime is 197813899. The next prime is 197813923. The reversal of 197813918 is 819318791.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49453478 + ... + 49453481.

It is an arithmetic number, because the mean of its divisors is an integer number (74180220).

Almost surely, 2^197813918 is an apocalyptic number.

197813918 is a deficient number, since it is larger than the sum of its proper divisors (98906962).

197813918 is an equidigital number, since it uses as much as digits as its factorization.

197813918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98906961.

The product of its digits is 108864, while the sum is 47.

The square root of 197813918 is about 14064.6335892550. The cubic root of 197813918 is about 582.6650227797.

The spelling of 197813918 in words is "one hundred ninety-seven million, eight hundred thirteen thousand, nine hundred eighteen".