221794386 has 32 divisors (see below), whose sum is σ = 485352000. Its totient is φ = 67010880.

The previous prime is 221794381. The next prime is 221794403. The reversal of 221794386 is 683497122.

It is a super-2 number, since 2×221794386² = 98385499322233992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221794381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18220 + ... + 27848.

It is an arithmetic number, because the mean of its divisors is an integer number (15167250).

Almost surely, 2^221794386 is an apocalyptic number.

221794386 is an abundant number, since it is smaller than the sum of its proper divisors (263557614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221794386 is a wasteful number, since it uses less digits than its factorization.

221794386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9994.

The product of its digits is 145152, while the sum is 42.

The square root of 221794386 is about 14892.7628732885. The cubic root of 221794386 is about 605.3178995458.

It can be divided in two parts, 22179 and 4386, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 221794386 in words is "two hundred twenty-one million, seven hundred ninety-four thousand, three hundred eighty-six".