191138420 has 48 divisors (see below), whose sum is σ = 452995200. Its totient is φ = 67105920.

The previous prime is 191138419. The next prime is 191138473. The reversal of 191138420 is 24831191.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8600 + ... + 21359.

It is an arithmetic number, because the mean of its divisors is an integer number (9437400).

Almost surely, 2^191138420 is an apocalyptic number.

191138420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191138420 is an abundant number, since it is smaller than the sum of its proper divisors (261856780).

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

191138420 is a wasteful number, since it uses less digits than its factorization.

191138420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30008 (or 30006 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 191138420 is about 13825.2819139430. The cubic root of 191138420 is about 576.0356081703.

The spelling of 191138420 in words is "one hundred ninety-one million, one hundred thirty-eight thousand, four hundred twenty".