19444402 has 4 divisors (see below), whose sum is σ = 29166606. Its totient is φ = 9722200.

The previous prime is 19444393. The next prime is 19444423. The reversal of 19444402 is 20444491.

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

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 2461761 = 4121^2 + 1569^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4861099 + ... + 4861102.

Almost surely, 2^19444402 is an apocalyptic number.

19444402 is a deficient number, since it is larger than the sum of its proper divisors (9722204).

19444402 is an equidigital number, since it uses as much as digits as its factorization.

19444402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9722203.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 19444402 is about 4409.5807056907. The cubic root of 19444402 is about 268.9045786770.

Adding to 19444402 its reverse (20444491), we get a palindrome (39888893).

The spelling of 19444402 in words is "nineteen million, four hundred forty-four thousand, four hundred two".