19431697 has 8 divisors (see below), whose sum is σ = 21131496. Its totient is φ = 17793792.

The previous prime is 19431691. The next prime is 19431707. The reversal of 19431697 is 79613491.

It can be written as a sum of positive squares in 4 ways, for example, as 8202496 + 11229201 = 2864^2 + 3351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19431697 - 2¹¹ = 19429649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19431691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14818 + ... + 16075.

It is an arithmetic number, because the mean of its divisors is an integer number (2641437).

Almost surely, 2^19431697 is an apocalyptic number.

19431697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19431697 is a deficient number, since it is larger than the sum of its proper divisors (1699799).

19431697 is a wasteful number, since it uses less digits than its factorization.

19431697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30947.

The product of its digits is 40824, while the sum is 40.

The square root of 19431697 is about 4408.1398571279. The cubic root of 19431697 is about 268.8459983713.

The spelling of 19431697 in words is "nineteen million, four hundred thirty-one thousand, six hundred ninety-seven".