194405820 has 48 divisors (see below), whose sum is σ = 622099968. Its totient is φ = 44435520.

The previous prime is 194405819. The next prime is 194405831. The reversal of 194405820 is 28504491.

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, 231016 + ... + 231855.

It is an arithmetic number, because the mean of its divisors is an integer number (12960416).

Almost surely, 2^194405820 is an apocalyptic number.

194405820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

194405820 is an abundant number, since it is smaller than the sum of its proper divisors (427694148).

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

194405820 is a wasteful number, since it uses less digits than its factorization.

194405820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462890 (or 462888 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 194405820 is about 13942.9487555538. The cubic root of 194405820 is about 579.2994117224.

The spelling of 194405820 in words is "one hundred ninety-four million, four hundred five thousand, eight hundred twenty".