191696390 has 16 divisors (see below), whose sum is σ = 348405408. Its totient is φ = 75933696.

The previous prime is 191696387. The next prime is 191696399. The reversal of 191696390 is 93696191.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191696399) 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, 92027 + ... + 94086.

It is an arithmetic number, because the mean of its divisors is an integer number (21775338).

Almost surely, 2^191696390 is an apocalyptic number.

191696390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191696390 is a deficient number, since it is larger than the sum of its proper divisors (156709018).

191696390 is a wasteful number, since it uses less digits than its factorization.

191696390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186223.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 191696390 is about 13845.4465439003. The cubic root of 191696390 is about 576.5955833989.

The spelling of 191696390 in words is "one hundred ninety-one million, six hundred ninety-six thousand, three hundred ninety".