194493390 has 128 divisors (see below), whose sum is σ = 579059712. Its totient is φ = 40711680.

The previous prime is 194493371. The next prime is 194493419. The reversal of 194493390 is 93394491.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 521244 + ... + 521616.

It is an arithmetic number, because the mean of its divisors is an integer number (4523904).

Almost surely, 2^194493390 is an apocalyptic number.

194493390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 194493390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289529856).

194493390 is an abundant number, since it is smaller than the sum of its proper divisors (384566322).

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

194493390 is a wasteful number, since it uses less digits than its factorization.

194493390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 194493390 is about 13946.0886989865. The cubic root of 194493390 is about 579.3863803711.

The spelling of 194493390 in words is "one hundred ninety-four million, four hundred ninety-three thousand, three hundred ninety".