197816640 has 112 divisors (see below), whose sum is σ = 717816192. Its totient is φ = 45213696.

The previous prime is 197816621. The next prime is 197816683. The reversal of 197816640 is 46618791.

It is a tau number, because it is divible by the number of its divisors (112).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 197816592 and 197816601.

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, 7999 + ... + 21438.

Almost surely, 2^197816640 is an apocalyptic number.

197816640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197816640 is an abundant number, since it is smaller than the sum of its proper divisors (519999552).

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

197816640 is a wasteful number, since it uses less digits than its factorization.

197816640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29464 (or 29454 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 197816640 is about 14064.7303564626. The cubic root of 197816640 is about 582.6676953368.

The spelling of 197816640 in words is "one hundred ninety-seven million, eight hundred sixteen thousand, six hundred forty".