194521890 has 16 divisors (see below), whose sum is σ = 466852608. Its totient is φ = 51872496.

The previous prime is 194521889. The next prime is 194521897. The reversal of 194521890 is 98125491.

It is not an unprimeable number, because it can be changed into a prime (194521897) 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, 3242002 + ... + 3242061.

It is an arithmetic number, because the mean of its divisors is an integer number (29178288).

Almost surely, 2^194521890 is an apocalyptic number.

194521890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

194521890 is an abundant number, since it is smaller than the sum of its proper divisors (272330718).

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

194521890 is a wasteful number, since it uses less digits than its factorization.

194521890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484073.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 194521890 is about 13947.1104534237. The cubic root of 194521890 is about 579.4146790284.

The spelling of 194521890 in words is "one hundred ninety-four million, five hundred twenty-one thousand, eight hundred ninety".