190806861 has 16 divisors (see below), whose sum is σ = 307857024. Its totient is φ = 102618624.

The previous prime is 190806859. The next prime is 190806881. The reversal of 190806861 is 168608091.

It is not a de Polignac number, because 190806861 - 2¹ = 190806859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190806851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266880 + ... + 267593.

It is an arithmetic number, because the mean of its divisors is an integer number (19241064).

Almost surely, 2^190806861 is an apocalyptic number.

It is an amenable number.

190806861 is a deficient number, since it is larger than the sum of its proper divisors (117050163).

190806861 is a wasteful number, since it uses less digits than its factorization.

190806861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534500.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 190806861 is about 13813.2856699628. The cubic root of 190806861 is about 575.7023412627.

The spelling of 190806861 in words is "one hundred ninety million, eight hundred six thousand, eight hundred sixty-one".