190809915 has 16 divisors (see below), whose sum is σ = 306226176. Its totient is φ = 101455200.

The previous prime is 190809893. The next prime is 190809917. The reversal of 190809915 is 519908091.

It is not a de Polignac number, because 190809915 - 2⁸ = 190809659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190809917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14251 + ... + 24180.

It is an arithmetic number, because the mean of its divisors is an integer number (19139136).

Almost surely, 2^190809915 is an apocalyptic number.

190809915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

190809915 is a deficient number, since it is larger than the sum of its proper divisors (115416261).

190809915 is a wasteful number, since it uses less digits than its factorization.

190809915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38770.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 190809915 is about 13813.3962152687. The cubic root of 190809915 is about 575.7054127553.

The spelling of 190809915 in words is "one hundred ninety million, eight hundred nine thousand, nine hundred fifteen".