19904401 has 4 divisors (see below), whose sum is σ = 21713904. Its totient is φ = 18094900.

The previous prime is 19904377. The next prime is 19904413. The reversal of 19904401 is 10440991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19904401 - 2⁷ = 19904273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19904401.

It is not an unprimeable number, because it can be changed into a prime (19904471) 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, 904735 + ... + 904756.

It is an arithmetic number, because the mean of its divisors is an integer number (5428476).

Almost surely, 2^19904401 is an apocalyptic number.

19904401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19904401 is a deficient number, since it is larger than the sum of its proper divisors (1809503).

19904401 is a wasteful number, since it uses less digits than its factorization.

19904401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809502.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 19904401 is about 4461.4348588767. The cubic root of 19904401 is about 271.0085780430.

The spelling of 19904401 in words is "nineteen million, nine hundred four thousand, four hundred one".