19404494 has 4 divisors (see below), whose sum is σ = 29106744. Its totient is φ = 9702246.

The previous prime is 19404493. The next prime is 19404499. The reversal of 19404494 is 49440491.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19404493) 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 as a sum of consecutive naturals, namely, 4851122 + ... + 4851125.

It is an arithmetic number, because the mean of its divisors is an integer number (7276686).

Almost surely, 2^19404494 is an apocalyptic number.

19404494 is a deficient number, since it is larger than the sum of its proper divisors (9702250).

19404494 is an equidigital number, since it uses as much as digits as its factorization.

19404494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9702249.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 19404494 is about 4405.0532346386. The cubic root of 19404494 is about 268.7204846620.

It can be divided in two parts, 1940449 and 4, that multiplied together give a square (7761796 = 2786²).

The spelling of 19404494 in words is "nineteen million, four hundred four thousand, four hundred ninety-four".