1908189426 has 64 divisors (see below), whose sum is σ = 4493905920. Its totient is φ = 532530240.

The previous prime is 1908189421. The next prime is 1908189427. The reversal of 1908189426 is 6249818091.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1908189421) 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 31 ways as a sum of consecutive naturals, for example, 408661 + ... + 413303.

It is an arithmetic number, because the mean of its divisors is an integer number (70217280).

Almost surely, 2^1908189426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1908189426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2246952960).

1908189426 is an abundant number, since it is smaller than the sum of its proper divisors (2585716494).

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

1908189426 is a wasteful number, since it uses less digits than its factorization.

1908189426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151.

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 1908189426 is about 43682.8275870507. The cubic root of 1908189426 is about 1240.3392728422.

The spelling of 1908189426 in words is "one billion, nine hundred eight million, one hundred eighty-nine thousand, four hundred twenty-six".