19913401 has 4 divisors (see below), whose sum is σ = 20600100. Its totient is φ = 19226704.

The previous prime is 19913393. The next prime is 19913407. The reversal of 19913401 is 10431991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4515625 + 15397776 = 2125^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 19913401 - 2³ = 19913393 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 19913401.

It is not an unprimeable number, because it can be changed into a prime (19913407) 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, 343306 + ... + 343363.

It is an arithmetic number, because the mean of its divisors is an integer number (5150025).

Almost surely, 2^19913401 is an apocalyptic number.

It is an amenable number.

19913401 is a deficient number, since it is larger than the sum of its proper divisors (686699).

19913401 is an equidigital number, since it uses as much as digits as its factorization.

19913401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686698.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 19913401 is about 4462.4433889967. The cubic root of 19913401 is about 271.0494184193.

The spelling of 19913401 in words is "nineteen million, nine hundred thirteen thousand, four hundred one".