19638493 has 8 divisors (see below), whose sum is σ = 22485312. Its totient is φ = 16802016.

The previous prime is 19638439. The next prime is 19638497. The reversal of 19638493 is 39483691.

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

It is not a de Polignac number, because 19638493 - 2¹³ = 19630301 is a prime.

It is a super-2 number, since 2×19638493² = 771340814622098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19638497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2046 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (2810664).

Almost surely, 2^19638493 is an apocalyptic number.

It is an amenable number.

19638493 is a deficient number, since it is larger than the sum of its proper divisors (2846819).

19638493 is an equidigital number, since it uses as much as digits as its factorization.

19638493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171.

The product of its digits is 139968, while the sum is 43.

The square root of 19638493 is about 4431.5339330755. The cubic root of 19638493 is about 269.7963393303.

The spelling of 19638493 in words is "nineteen million, six hundred thirty-eight thousand, four hundred ninety-three".