190786890 has 64 divisors (see below), whose sum is σ = 534009600. Its totient is φ = 43606080.

The previous prime is 190786873. The next prime is 190786907. The reversal of 190786890 is 98687091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (190786873) and next prime (190786907).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1020 + ... + 19560.

It is an arithmetic number, because the mean of its divisors is an integer number (8343900).

Almost surely, 2^190786890 is an apocalyptic number.

190786890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 190786890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267004800).

190786890 is an abundant number, since it is smaller than the sum of its proper divisors (343222710).

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

190786890 is a wasteful number, since it uses less digits than its factorization.

190786890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18572 (or 18558 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 190786890 is about 13812.5627600384. The cubic root of 190786890 is about 575.6822550657.

The spelling of 190786890 in words is "one hundred ninety million, seven hundred eighty-six thousand, eight hundred ninety".