194978840 has 96 divisors (see below), whose sum is σ = 526953600. Its totient is φ = 64673280.

The previous prime is 194978801. The next prime is 194978857. The reversal of 194978840 is 48879491.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 59156 + ... + 62364.

It is an arithmetic number, because the mean of its divisors is an integer number (5489100).

Almost surely, 2^194978840 is an apocalyptic number.

194978840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 194978840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263476800).

194978840 is an abundant number, since it is smaller than the sum of its proper divisors (331974760).

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

194978840 is a wasteful number, since it uses less digits than its factorization.

194978840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265 (or 3254 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 194978840 is about 13963.4823736774. The cubic root of 194978840 is about 579.8680238758.

The spelling of 194978840 in words is "one hundred ninety-four million, nine hundred seventy-eight thousand, eight hundred forty".