197681590 has 16 divisors (see below), whose sum is σ = 356020272. Its totient is φ = 79029664.

The previous prime is 197681587. The next prime is 197681611. The reversal of 197681590 is 95186791.

It is a happy number.

197681590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×197681590² = 78156022049856200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 197681590.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19377 + ... + 27763.

It is an arithmetic number, because the mean of its divisors is an integer number (22251267).

Almost surely, 2^197681590 is an apocalyptic number.

197681590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197681590 is a deficient number, since it is larger than the sum of its proper divisors (158338682).

197681590 is a wasteful number, since it uses less digits than its factorization.

197681590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10751.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 197681590 is about 14059.9285204442. The cubic root of 197681590 is about 582.5350688361.

The spelling of 197681590 in words is "one hundred ninety-seven million, six hundred eighty-one thousand, five hundred ninety".