194909490 has 80 divisors (see below), whose sum is σ = 536964120. Its totient is φ = 50699520.

The previous prime is 194909447. The next prime is 194909503. The reversal of 194909490 is 94909491.

194909490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 60326289 + 134583201 = 7767^2 + 11601^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 30276 + ... + 36144.

Almost surely, 2^194909490 is an apocalyptic number.

194909490 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 194909490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268482060).

194909490 is an abundant number, since it is smaller than the sum of its proper divisors (342054630).

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

194909490 is a wasteful number, since it uses less digits than its factorization.

194909490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5929 (or 5920 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 194909490 is about 13960.9988897643. The cubic root of 194909490 is about 579.7992666436.

Subtracting from 194909490 its reverse (94909491), we obtain a palindrome (99999999).

The spelling of 194909490 in words is "one hundred ninety-four million, nine hundred nine thousand, four hundred ninety".