191004920 has 16 divisors (see below), whose sum is σ = 429761160. Its totient is φ = 76401952.

The previous prime is 191004901. The next prime is 191004923. The reversal of 191004920 is 29400191.

It is a self number, because there is not a number n which added to its sum of digits gives 191004920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191004923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2387522 + ... + 2387601.

Almost surely, 2^191004920 is an apocalyptic number.

191004920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191004920 is an abundant number, since it is smaller than the sum of its proper divisors (238756240).

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

191004920 is a wasteful number, since it uses less digits than its factorization.

191004920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775134 (or 4775130 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 191004920 is about 13820.4529592919. The cubic root of 191004920 is about 575.9014668774.

The spelling of 191004920 in words is "one hundred ninety-one million, four thousand, nine hundred twenty".