197491440 has 40 divisors (see below), whose sum is σ = 612224208. Its totient is φ = 52664320.

The previous prime is 197491439. The next prime is 197491447. The reversal of 197491440 is 44194791.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×197491440³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197491447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411201 + ... + 411680.

Almost surely, 2^197491440 is an apocalyptic number.

197491440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197491440 is an abundant number, since it is smaller than the sum of its proper divisors (414732768).

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

197491440 is a wasteful number, since it uses less digits than its factorization.

197491440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822897 (or 822891 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 197491440 is about 14053.1647681225. The cubic root of 197491440 is about 582.3482286780.

The spelling of 197491440 in words is "one hundred ninety-seven million, four hundred ninety-one thousand, four hundred forty".