197678390 has 32 divisors (see below), whose sum is σ = 437935680. Its totient is φ = 62561664.

The previous prime is 197678389. The next prime is 197678419. The reversal of 197678390 is 93876791.

197678390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107705 + ... + 109524.

It is an arithmetic number, because the mean of its divisors is an integer number (13685490).

Almost surely, 2^197678390 is an apocalyptic number.

197678390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197678390 is an abundant number, since it is smaller than the sum of its proper divisors (240257290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197678390 is a wasteful number, since it uses less digits than its factorization.

197678390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217256.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 197678390 is about 14059.8147213966. The cubic root of 197678390 is about 582.5319255283.

The spelling of 197678390 in words is "one hundred ninety-seven million, six hundred seventy-eight thousand, three hundred ninety".