190000505 has 8 divisors (see below), whose sum is σ = 229665672. Its totient is φ = 150890368.

The previous prime is 190000501. The next prime is 190000507. The reversal of 190000505 is 505000091.

It can be written as a sum of positive squares in 4 ways, for example, as 67831696 + 122168809 = 8236^2 + 11053^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 190000505 - 2² = 190000501 is a prime.

It is a super-2 number, since 2×190000505² = 72200383800510050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190000501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138002 + ... + 139371.

It is an arithmetic number, because the mean of its divisors is an integer number (28708209).

Almost surely, 2^190000505 is an apocalyptic number.

It is an amenable number.

190000505 is a deficient number, since it is larger than the sum of its proper divisors (39665167).

190000505 is a wasteful number, since it uses less digits than its factorization.

190000505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277515.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 190000505 is about 13784.0670703534. The cubic root of 190000505 is about 574.8902172261.

Adding to 190000505 its reverse (505000091), we get a palindrome (695000596).

The spelling of 190000505 in words is "one hundred ninety million, five hundred five", and thus it is an aban number.