19171994 has 12 divisors (see below), whose sum is σ = 29593374. Its totient is φ = 9308592.

The previous prime is 19171993. The next prime is 19172003. The reversal of 19171994 is 49917191.

It can be written as a sum of positive squares in 3 ways, for example, as 18601969 + 570025 = 4313^2 + 755^2 .

It is not an unprimeable number, because it can be changed into a prime (19171993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37412 + ... + 37920.

Almost surely, 2^19171994 is an apocalyptic number.

19171994 is a deficient number, since it is larger than the sum of its proper divisors (10421380).

19171994 is an frugal number, since it uses more digits than its factorization.

19171994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 548 counting only the distinct ones).

The product of its digits is 20412, while the sum is 41.

The square root of 19171994 is about 4378.5835609247. The cubic root of 19171994 is about 267.6429212674.

The spelling of 19171994 in words is "nineteen million, one hundred seventy-one thousand, nine hundred ninety-four".