19404999 has 6 divisors (see below), whose sum is σ = 28029456. Its totient is φ = 12936660.

The previous prime is 19404961. The next prime is 19405003. The reversal of 19404999 is 99940491.

It is not a de Polignac number, because 19404999 - 2⁸ = 19404743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19404919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1078047 + ... + 1078064.

It is an arithmetic number, because the mean of its divisors is an integer number (4671576).

Almost surely, 2^19404999 is an apocalyptic number.

19404999 is a deficient number, since it is larger than the sum of its proper divisors (8624457).

19404999 is a wasteful number, since it uses less digits than its factorization.

19404999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156117 (or 2156114 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19404999 is about 4405.1105547988. The cubic root of 19404999 is about 268.7228157829.

The spelling of 19404999 in words is "nineteen million, four hundred four thousand, nine hundred ninety-nine".