19693427 has 4 divisors (see below), whose sum is σ = 21208320. Its totient is φ = 18178536.

The previous prime is 19693417. The next prime is 19693439. The reversal of 19693427 is 72439691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72439691 = 1019 ⋅71089.

It is a cyclic number.

It is not a de Polignac number, because 19693427 - 2⁴ = 19693411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19693417) 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, 757427 + ... + 757452.

It is an arithmetic number, because the mean of its divisors is an integer number (5302080).

Almost surely, 2^19693427 is an apocalyptic number.

19693427 is a deficient number, since it is larger than the sum of its proper divisors (1514893).

19693427 is a wasteful number, since it uses less digits than its factorization.

19693427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514892.

The product of its digits is 81648, while the sum is 41.

The square root of 19693427 is about 4437.7276842997. The cubic root of 19693427 is about 270.0476687669.

The spelling of 19693427 in words is "nineteen million, six hundred ninety-three thousand, four hundred twenty-seven".