194432640 has 64 divisors (see below), whose sum is σ = 619760160. Its totient is φ = 51848192.

The previous prime is 194432629. The next prime is 194432647. The reversal of 194432640 is 46234491.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (194432647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48714 + ... + 52553.

Almost surely, 2^194432640 is an apocalyptic number.

194432640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194432640 is an abundant number, since it is smaller than the sum of its proper divisors (425327520).

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

194432640 is a wasteful number, since it uses less digits than its factorization.

194432640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101289 (or 101277 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 194432640 is about 13943.9104988522. The cubic root of 194432640 is about 579.3260503209.

The spelling of 194432640 in words is "one hundred ninety-four million, four hundred thirty-two thousand, six hundred forty".