19712401 has 6 divisors (see below), whose sum is σ = 20940470. Its totient is φ = 18552576.

The previous prime is 19712389. The next prime is 19712419. The reversal of 19712401 is 10421791.

It can be written as a sum of positive squares in 3 ways, for example, as 7706176 + 12006225 = 2776^2 + 3465^2 .

It is not a de Polignac number, because 19712401 - 2⁹ = 19711889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19712471) 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 5 ways as a sum of consecutive naturals, for example, 33816 + ... + 34393.

Almost surely, 2^19712401 is an apocalyptic number.

It is an amenable number.

19712401 is a deficient number, since it is larger than the sum of its proper divisors (1228069).

19712401 is an equidigital number, since it uses as much as digits as its factorization.

19712401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68243 (or 68226 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 19712401 is about 4439.8649754244. The cubic root of 19712401 is about 270.1343684185.

The spelling of 19712401 in words is "nineteen million, seven hundred twelve thousand, four hundred one".