90191838 has 16 divisors (see below), whose sum is σ = 196782336. Its totient is φ = 27330840.

The previous prime is 90191833. The next prime is 90191839. The reversal of 90191838 is 83819109.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 90191796 and 90191805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90191831) 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, 683206 + ... + 683337.

It is an arithmetic number, because the mean of its divisors is an integer number (12298896).

Almost surely, 2^90191838 is an apocalyptic number.

90191838 is an abundant number, since it is smaller than the sum of its proper divisors (106590498).

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

90191838 is a wasteful number, since it uses less digits than its factorization.

90191838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366559.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 90191838 is about 9496.9383487522. The cubic root of 90191838 is about 448.4586574768.

The spelling of 90191838 in words is "ninety million, one hundred ninety-one thousand, eight hundred thirty-eight".