19228894 has 4 divisors (see below), whose sum is σ = 28843344. Its totient is φ = 9614446.

The previous prime is 19228879. The next prime is 19228907. The reversal of 19228894 is 49882291.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 19228894.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4807222 + ... + 4807225.

It is an arithmetic number, because the mean of its divisors is an integer number (7210836).

Almost surely, 2^19228894 is an apocalyptic number.

19228894 is a deficient number, since it is larger than the sum of its proper divisors (9614450).

19228894 is an equidigital number, since it uses as much as digits as its factorization.

19228894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9614449.

The product of its digits is 82944, while the sum is 43.

The square root of 19228894 is about 4385.0762821187. The cubic root of 19228894 is about 267.9074362891.

It can be divided in two parts, 1922 and 8894, that added together give a square (10816 = 104²).

The spelling of 19228894 in words is "nineteen million, two hundred twenty-eight thousand, eight hundred ninety-four".