19718994 has 16 divisors (see below), whose sum is σ = 39561120. Its totient is φ = 6552480.

The previous prime is 19718989. The next prime is 19718999. The reversal of 19718994 is 49981791.

It is an interprime number because it is at equal distance from previous prime (19718989) and next prime (19718999).

It is not an unprimeable number, because it can be changed into a prime (19718999) 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, 2979 + ... + 6950.

It is an arithmetic number, because the mean of its divisors is an integer number (2472570).

Almost surely, 2^19718994 is an apocalyptic number.

19718994 is an abundant number, since it is smaller than the sum of its proper divisors (19842126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19718994 is a wasteful number, since it uses less digits than its factorization.

19718994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10265.

The product of its digits is 163296, while the sum is 48.

The square root of 19718994 is about 4440.6073908870. The cubic root of 19718994 is about 270.1644813978.

It can be divided in two parts, 197 and 18994, that added together give a palindrome (19191).

The spelling of 19718994 in words is "nineteen million, seven hundred eighteen thousand, nine hundred ninety-four".