194497990 has 16 divisors (see below), whose sum is σ = 353497248. Its totient is φ = 77043456.

The previous prime is 194497949. The next prime is 194497991. The reversal of 194497990 is 99794491.

It is a super-2 number, since 2×194497990² = 75658936228080200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194497991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93387 + ... + 95446.

It is an arithmetic number, because the mean of its divisors is an integer number (22093578).

Almost surely, 2^194497990 is an apocalyptic number.

194497990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

194497990 is a deficient number, since it is larger than the sum of its proper divisors (158999258).

194497990 is a wasteful number, since it uses less digits than its factorization.

194497990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188943.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 194497990 is about 13946.2536188039. The cubic root of 194497990 is about 579.3909480607.

The spelling of 194497990 in words is "one hundred ninety-four million, four hundred ninety-seven thousand, nine hundred ninety".