19912000 has 112 divisors (see below), whose sum is σ = 52303680. Its totient is φ = 7488000.

The previous prime is 19911979. The next prime is 19912001. The reversal of 19912000 is 21991.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151935 + ... + 152065.

Almost surely, 2^19912000 is an apocalyptic number.

19912000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19912000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26151840).

19912000 is an abundant number, since it is smaller than the sum of its proper divisors (32391680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19912000 is a wasteful number, since it uses less digits than its factorization.

19912000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 19912000 is about 4462.2864094542. The cubic root of 19912000 is about 271.0430617428.

Adding to 19912000 its reverse (21991), we get a palindrome (19933991).

The spelling of 19912000 in words is "nineteen million, nine hundred twelve thousand".