19627997 has 4 divisors (see below), whose sum is σ = 19671036. Its totient is φ = 19584960.

The previous prime is 19627963. The next prime is 19628017. The reversal of 19627997 is 79972691.

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 12716356 + 6911641 = 3566^2 + 2629^2 .

It is a cyclic number.

It is not a de Polignac number, because 19627997 - 2¹⁰ = 19626973 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 (19627297) 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, 20828 + ... + 21749.

It is an arithmetic number, because the mean of its divisors is an integer number (4917759).

Almost surely, 2^19627997 is an apocalyptic number.

It is an amenable number.

19627997 is a deficient number, since it is larger than the sum of its proper divisors (43039).

19627997 is an equidigital number, since it uses as much as digits as its factorization.

19627997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43038.

The product of its digits is 428652, while the sum is 50.

The square root of 19627997 is about 4430.3495347433. The cubic root of 19627997 is about 269.7482655971.

The spelling of 19627997 in words is "nineteen million, six hundred twenty-seven thousand, nine hundred ninety-seven".