19404401 has 4 divisors (see below), whose sum is σ = 19417332. Its totient is φ = 19391472.

The previous prime is 19404397. The next prime is 19404409. The reversal of 19404401 is 10440491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10440491 = 211 ⋅49481.

It can be written as a sum of positive squares in 2 ways, for example, as 6451600 + 12952801 = 2540^2 + 3599^2 .

It is a cyclic number.

It is not a de Polignac number, because 19404401 - 2² = 19404397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19404409) 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, 3866 + ... + 7331.

It is an arithmetic number, because the mean of its divisors is an integer number (4854333).

Almost surely, 2^19404401 is an apocalyptic number.

It is an amenable number.

19404401 is a deficient number, since it is larger than the sum of its proper divisors (12931).

19404401 is a wasteful number, since it uses less digits than its factorization.

19404401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12930.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 19404401 is about 4405.0426785674. The cubic root of 19404401 is about 268.7200553620.

Adding to 19404401 its reverse (10440491), we get a palindrome (29844892).

The spelling of 19404401 in words is "nineteen million, four hundred four thousand, four hundred one".