19051812 has 36 divisors (see below), whose sum is σ = 51864540. Its totient is φ = 5861952.

The previous prime is 19051801. The next prime is 19051819. The reversal of 19051812 is 21815091.

It can be written as a sum of positive squares in 2 ways, for example, as 4260096 + 14791716 = 2064^2 + 3846^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (19051819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19887 + ... + 20822.

Almost surely, 2^19051812 is an apocalyptic number.

19051812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19051812 is an abundant number, since it is smaller than the sum of its proper divisors (32812728).

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

19051812 is a wasteful number, since it uses less digits than its factorization.

19051812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40732 (or 40727 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 19051812 is about 4364.8381413290. The cubic root of 19051812 is about 267.0824977576.

The spelling of 19051812 in words is "nineteen million, fifty-one thousand, eight hundred twelve".