190995421 has 4 divisors (see below), whose sum is σ = 197581500. Its totient is φ = 184409344.

The previous prime is 190995403. The next prime is 190995437. The reversal of 190995421 is 124599091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57592921 + 133402500 = 7589^2 + 11550^2 .

It is a cyclic number.

It is not a de Polignac number, because 190995421 - 2¹¹ = 190993373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190995481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3292996 + ... + 3293053.

It is an arithmetic number, because the mean of its divisors is an integer number (49395375).

Almost surely, 2^190995421 is an apocalyptic number.

It is an amenable number.

190995421 is a deficient number, since it is larger than the sum of its proper divisors (6586079).

190995421 is an equidigital number, since it uses as much as digits as its factorization.

190995421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6586078.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 190995421 is about 13820.1092976865. The cubic root of 190995421 is about 575.8919198656.

The spelling of 190995421 in words is "one hundred ninety million, nine hundred ninety-five thousand, four hundred twenty-one".