19129972 has 6 divisors (see below), whose sum is σ = 33477458. Its totient is φ = 9564984.

The previous prime is 19129963. The next prime is 19130011. The reversal of 19129972 is 27992191.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18974736 + 155236 = 4356^2 + 394^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2391243 + ... + 2391250.

Almost surely, 2^19129972 is an apocalyptic number.

It is an amenable number.

19129972 is a deficient number, since it is larger than the sum of its proper divisors (14347486).

19129972 is a wasteful number, since it uses less digits than its factorization.

19129972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782497 (or 4782495 counting only the distinct ones).

The product of its digits is 20412, while the sum is 40.

The square root of 19129972 is about 4373.7823448361. The cubic root of 19129972 is about 267.4472344756.

The spelling of 19129972 in words is "nineteen million, one hundred twenty-nine thousand, nine hundred seventy-two".