19404442 has 8 divisors (see below), whose sum is σ = 29516832. Its totient is φ = 9565500.

The previous prime is 19404409. The next prime is 19404443. The reversal of 19404442 is 24440491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19404442.

It is not an unprimeable number, because it can be changed into a prime (19404443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68184 + ... + 68467.

It is an arithmetic number, because the mean of its divisors is an integer number (3689604).

Almost surely, 2^19404442 is an apocalyptic number.

19404442 is a deficient number, since it is larger than the sum of its proper divisors (10112390).

19404442 is a wasteful number, since it uses less digits than its factorization.

19404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136724.

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

The square root of 19404442 is about 4405.0473323223. The cubic root of 19404442 is about 268.7202446235.

The spelling of 19404442 in words is "nineteen million, four hundred four thousand, four hundred forty-two".