17986972 has 12 divisors (see below), whose sum is σ = 31547880. Its totient is φ = 8973296.

The previous prime is 17986967. The next prime is 17986973. The reversal of 17986972 is 27968971.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17986973) 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, 2947 + ... + 6682.

It is an arithmetic number, because the mean of its divisors is an integer number (2628990).

Almost surely, 2^17986972 is an apocalyptic number.

It is an amenable number.

17986972 is a deficient number, since it is larger than the sum of its proper divisors (13560908).

17986972 is a wasteful number, since it uses less digits than its factorization.

17986972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100 (or 10098 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 17986972 is about 4241.1050446788. The cubic root of 17986972 is about 262.0108963477.

The spelling of 17986972 in words is "seventeen million, nine hundred eighty-six thousand, nine hundred seventy-two".