190861920 has 144 divisors (see below), whose sum is σ = 675576720. Its totient is φ = 50886144.

The previous prime is 190861919. The next prime is 190861921. The reversal of 190861920 is 29168091.

190861920 is a `hidden beast` number, since 19 + 0 + 8 + 619 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (190861919) and next prime (190861921).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190861921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36426 + ... + 41334.

It is an arithmetic number, because the mean of its divisors is an integer number (4691505).

Almost surely, 2^190861920 is an apocalyptic number.

190861920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 190861920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337788360).

190861920 is an abundant number, since it is smaller than the sum of its proper divisors (484714800).

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

190861920 is an equidigital number, since it uses as much as digits as its factorization.

190861920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939 (or 4919 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 190861920 is about 13815.2784988215. The cubic root of 190861920 is about 575.7577105974.

The spelling of 190861920 in words is "one hundred ninety million, eight hundred sixty-one thousand, nine hundred twenty".