19749812 has 24 divisors (see below), whose sum is σ = 36174600. Its totient is φ = 9422336.

The previous prime is 19749809. The next prime is 19749827. The reversal of 19749812 is 21894791.

It can be written as a sum of positive squares in 4 ways, for example, as 3701776 + 16048036 = 1924^2 + 4006^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19749812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9368 + ... + 11280.

It is an arithmetic number, because the mean of its divisors is an integer number (1507275).

Almost surely, 2^19749812 is an apocalyptic number.

It is an amenable number.

19749812 is a deficient number, since it is larger than the sum of its proper divisors (16424788).

19749812 is a wasteful number, since it uses less digits than its factorization.

19749812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035 (or 2033 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 19749812 is about 4444.0760569549. The cubic root of 19749812 is about 270.3051511050.

The spelling of 19749812 in words is "nineteen million, seven hundred forty-nine thousand, eight hundred twelve".