19990972 has 12 divisors (see below), whose sum is σ = 35199976. Its totient is φ = 9933840.

The previous prime is 19990937. The next prime is 19991003. The reversal of 19990972 is 27909991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14679 + ... + 15982.

Almost surely, 2^19990972 is an apocalyptic number.

It is an amenable number.

19990972 is a deficient number, since it is larger than the sum of its proper divisors (15209004).

19990972 is a wasteful number, since it uses less digits than its factorization.

19990972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30828 (or 30826 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 19990972 is about 4471.1264799824. The cubic root of 19990972 is about 271.4009125754.

The spelling of 19990972 in words is "nineteen million, nine hundred ninety thousand, nine hundred seventy-two".