190821268 has 12 divisors (see below), whose sum is σ = 364295232. Its totient is φ = 86736920.

The previous prime is 190821263. The next prime is 190821287. The reversal of 190821268 is 862128091.

It is a super-2 number, since 2×190821268² = 72825512642255648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190821263) 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, 2168380 + ... + 2168467.

It is an arithmetic number, because the mean of its divisors is an integer number (30357936).

Almost surely, 2^190821268 is an apocalyptic number.

It is an amenable number.

190821268 is a deficient number, since it is larger than the sum of its proper divisors (173473964).

190821268 is a wasteful number, since it uses less digits than its factorization.

190821268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336862 (or 4336860 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 190821268 is about 13813.8071508183. The cubic root of 190821268 is about 575.7168304952.

The spelling of 190821268 in words is "one hundred ninety million, eight hundred twenty-one thousand, two hundred sixty-eight".