190440001 has 8 divisors (see below), whose sum is σ = 203116680. Its totient is φ = 177927168.

The previous prime is 190439989. The next prime is 190440011. The reversal of 190440001 is 100044091.

It is a Cunningham number, because it is equal to 13800²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 26625600 + 163814401 = 5160^2 + 12799^2 .

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

It is not a de Polignac number, because 190440001 - 2¹⁷ = 190308929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190440011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38556 + ... + 43213.

It is an arithmetic number, because the mean of its divisors is an integer number (25389585).

Almost surely, 2^190440001 is an apocalyptic number.

It is an amenable number.

190440001 is a deficient number, since it is larger than the sum of its proper divisors (12676679).

190440001 is a wasteful number, since it uses less digits than its factorization.

190440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81923.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 190440001 is about 13800.0000362319. Note that the first 4 decimals coincide. The cubic root of 190440001 is about 575.3331412901. Note that the first 3 decimals are identical.

Adding to 190440001 its reverse (100044091), we get a palindrome (290484092).

It can be divided in two parts, 1904 and 40001, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 190440001 in words is "one hundred ninety million, four hundred forty thousand, one".