19993401 has 12 divisors (see below), whose sum is σ = 28931760. Its totient is φ = 13304760.

The previous prime is 19993381. The next prime is 19993447. The reversal of 19993401 is 10439991.

It is not a de Polignac number, because 19993401 - 2⁷ = 19993273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19993451) 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 in 11 ways as a sum of consecutive naturals, for example, 4246 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (2410980).

Almost surely, 2^19993401 is an apocalyptic number.

It is an amenable number.

19993401 is a deficient number, since it is larger than the sum of its proper divisors (8938359).

19993401 is a wasteful number, since it uses less digits than its factorization.

19993401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036 (or 4033 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 19993401 is about 4471.3981035019. The cubic root of 19993401 is about 271.4119043057.

The spelling of 19993401 in words is "nineteen million, nine hundred ninety-three thousand, four hundred one".