194139918 has 96 divisors (see below), whose sum is σ = 518049792. Its totient is φ = 51321600.

The previous prime is 194139899. The next prime is 194139919. The reversal of 194139918 is 819931491.

194139918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×194139918² = 75380615522093448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194139919) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88758 + ... + 90918.

It is an arithmetic number, because the mean of its divisors is an integer number (5396352).

Almost surely, 2^194139918 is an apocalyptic number.

194139918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 194139918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259024896).

194139918 is an abundant number, since it is smaller than the sum of its proper divisors (323909874).

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

194139918 is a wasteful number, since it uses less digits than its factorization.

194139918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230 (or 2227 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 194139918 is about 13933.4101353545. The cubic root of 194139918 is about 579.0351755411.

The spelling of 194139918 in words is "one hundred ninety-four million, one hundred thirty-nine thousand, nine hundred eighteen".