197398378 has 4 divisors (see below), whose sum is σ = 296097570. Its totient is φ = 98699188.

The previous prime is 197398361. The next prime is 197398381. The reversal of 197398378 is 873893791.

197398378 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873893791 = 149 ⋅5865059.

It can be written as a sum of positive squares in only one way, i.e., 188595289 + 8803089 = 13733^2 + 2967^2 .

It is a super-2 number, since 2×197398378² = 77932239274061768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49349593 + ... + 49349596.

Almost surely, 2^197398378 is an apocalyptic number.

197398378 is a deficient number, since it is larger than the sum of its proper divisors (98699192).

197398378 is an equidigital number, since it uses as much as digits as its factorization.

197398378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98699191.

The product of its digits is 2286144, while the sum is 55.

The square root of 197398378 is about 14049.8533088428. The cubic root of 197398378 is about 582.2567428469.

The spelling of 197398378 in words is "one hundred ninety-seven million, three hundred ninety-eight thousand, three hundred seventy-eight".