190821284 has 12 divisors (see below), whose sum is σ = 342962844. Its totient is φ = 92831904.

The previous prime is 190821263. The next prime is 190821287. The reversal of 190821284 is 482128091.

It can be written as a sum of positive squares in 2 ways, for example, as 125664100 + 65157184 = 11210^2 + 8072^2 .

It is not an unprimeable number, because it can be changed into a prime (190821287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644519 + ... + 644814.

It is an arithmetic number, because the mean of its divisors is an integer number (28580237).

Almost surely, 2^190821284 is an apocalyptic number.

It is an amenable number.

190821284 is a deficient number, since it is larger than the sum of its proper divisors (152141560).

190821284 is a wasteful number, since it uses less digits than its factorization.

190821284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289374 (or 1289372 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 190821284 is about 13813.8077299490. The cubic root of 190821284 is about 575.7168465861.

The spelling of 190821284 in words is "one hundred ninety million, eight hundred twenty-one thousand, two hundred eighty-four".