• 190 can be written using four 4's:

190 has 8 divisors (see below), whose sum is σ = 360. Its totient is φ = 72.

The previous prime is 181. The next prime is 191. The reversal of 190 is 91.

190 = 4^{2} + 5^{2} + ... + 8^{2}.

It is a happy number.

190 is nontrivially palindromic in base 4.

190 is a nontrivial binomial coefficient, being equal to C(20, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

190 is an astonishing number since 190 = 0 + ... + 19.

It is a super-2 number, since 2×190^{2} = 72200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 19 = 190 / (1 + 9 + 0).

190 is an idoneal number.

It is a plaindrome in base 12, base 13 and base 16.

It is a nialpdrome in base 14 and base 15.

It is a congruent number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 19.

It is an arithmetic number, because the mean of its divisors is an integer number (45).

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

190 is the 19-th triangular number and also the 10-th hexagonal number.

190 is the 7-th centered nonagonal number.

190 is a deficient number, since it is larger than the sum of its proper divisors (170).

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

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

The sum of its prime factors is 26.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 190 is about 13.7840487521. The cubic root of 190 is about 5.7488970789.

Subtracting from 190 its reverse (91), we obtain a palindrome (99).

It can be divided in two parts, 1 and 90, that added together give a triangular number (91 = T_{13}).

The spelling of 190 in words is "one hundred ninety", and thus it is an aban number.

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