19916972 has 12 divisors (see below), whose sum is σ = 35050680. Its totient is φ = 9902496.

The previous prime is 19916951. The next prime is 19916977. The reversal of 19916972 is 27961991.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (19916977) 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, 13193 + ... + 14624.

It is an arithmetic number, because the mean of its divisors is an integer number (2920890).

Almost surely, 2^19916972 is an apocalyptic number.

It is an amenable number.

19916972 is a deficient number, since it is larger than the sum of its proper divisors (15133708).

19916972 is a wasteful number, since it uses less digits than its factorization.

19916972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28000 (or 27998 counting only the distinct ones).

The product of its digits is 61236, while the sum is 44.

The square root of 19916972 is about 4462.8434881810. The cubic root of 19916972 is about 271.0656195631.

It can be divided in two parts, 199 and 16972, that added together give a palindrome (17171).

The spelling of 19916972 in words is "nineteen million, nine hundred sixteen thousand, nine hundred seventy-two".