190991806 has 8 divisors (see below), whose sum is σ = 295729344. Its totient is φ = 92415360.

The previous prime is 190991789. The next prime is 190991833. The reversal of 190991806 is 608199091.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1540195 + ... + 1540318.

It is an arithmetic number, because the mean of its divisors is an integer number (36966168).

Almost surely, 2^190991806 is an apocalyptic number.

190991806 is a deficient number, since it is larger than the sum of its proper divisors (104737538).

190991806 is a wasteful number, since it uses less digits than its factorization.

190991806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080546.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 190991806 is about 13819.9785093899. The cubic root of 190991806 is about 575.8882865107. Note that the first 3 decimals are identical.

The spelling of 190991806 in words is "one hundred ninety million, nine hundred ninety-one thousand, eight hundred six".