19640027 has 4 divisors (see below), whose sum is σ = 21425496. Its totient is φ = 17854560.

The previous prime is 19640021. The next prime is 19640029. The reversal of 19640027 is 72004691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72004691 = 11 ⋅6545881.

It is a cyclic number.

It is not a de Polignac number, because 19640027 - 2⁴ = 19640011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19640021) 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, 892718 + ... + 892739.

It is an arithmetic number, because the mean of its divisors is an integer number (5356374).

Almost surely, 2^19640027 is an apocalyptic number.

19640027 is a deficient number, since it is larger than the sum of its proper divisors (1785469).

19640027 is a wasteful number, since it uses less digits than its factorization.

19640027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785468.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 19640027 is about 4431.7070074634. The cubic root of 19640027 is about 269.8033639156.

It can be divided in two parts, 19 and 640027, that added together give a palindrome (640046).

The spelling of 19640027 in words is "nineteen million, six hundred forty thousand, twenty-seven".