191390190 has 32 divisors (see below), whose sum is σ = 466197120. Its totient is φ = 50275104.

The previous prime is 191390189. The next prime is 191390191. The reversal of 191390190 is 91093191.

It is an interprime number because it is at equal distance from previous prime (191390189) and next prime (191390191).

It is a super-2 number, since 2×191390190² = 73260409656472200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191390191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45600 + ... + 49619.

It is an arithmetic number, because the mean of its divisors is an integer number (14568660).

Almost surely, 2^191390190 is an apocalyptic number.

191390190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191390190 is an abundant number, since it is smaller than the sum of its proper divisors (274806930).

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

191390190 is a wasteful number, since it uses less digits than its factorization.

191390190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95296.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 191390190 is about 13834.3843375844. The cubic root of 191390190 is about 576.2884177203.

The spelling of 191390190 in words is "one hundred ninety-one million, three hundred ninety thousand, one hundred ninety".