19081812 has 48 divisors (see below), whose sum is σ = 47480832. Its totient is φ = 5950560.

The previous prime is 19081807. The next prime is 19081813. The reversal of 19081812 is 21818091.

It is a self number, because there is not a number n which added to its sum of digits gives 19081812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19081813) 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, 12237 + ... + 13707.

It is an arithmetic number, because the mean of its divisors is an integer number (989184).

Almost surely, 2^19081812 is an apocalyptic number.

19081812 is a gapful number since it is divisible by the number (12) 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 19081812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23740416).

19081812 is an abundant number, since it is smaller than the sum of its proper divisors (28399020).

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

19081812 is a wasteful number, since it uses less digits than its factorization.

19081812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 19081812 is about 4368.2733430956. The cubic root of 19081812 is about 267.2226116916. Note that the first 3 decimals are identical.

The spelling of 19081812 in words is "nineteen million, eighty-one thousand, eight hundred twelve".