194993290 has 16 divisors (see below), whose sum is σ = 351508320. Its totient is φ = 77881680.

The previous prime is 194993243. The next prime is 194993297. The reversal of 194993290 is 92399491.

It is a self number, because there is not a number n which added to its sum of digits gives 194993290.

It is not an unprimeable number, because it can be changed into a prime (194993297) 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, 7200 + ... + 21019.

It is an arithmetic number, because the mean of its divisors is an integer number (21969270).

Almost surely, 2^194993290 is an apocalyptic number.

194993290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

194993290 is a deficient number, since it is larger than the sum of its proper divisors (156515030).

194993290 is a wasteful number, since it uses less digits than its factorization.

194993290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28917.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 194993290 is about 13963.9997851618. Note that the first 3 decimals coincide. The cubic root of 194993290 is about 579.8823483122.

The spelling of 194993290 in words is "one hundred ninety-four million, nine hundred ninety-three thousand, two hundred ninety".