19418436 has 18 divisors (see below), whose sum is σ = 49085582. Its totient is φ = 6472800.

The previous prime is 19418423. The next prime is 19418447. The reversal of 19418436 is 63481491.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 4161600 = 3906^2 + 2040^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 539401 = 19418436 / (1 + 9 + 4 + 1 + 8 + 4 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 19418436.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 269665 + ... + 269736.

Almost surely, 2^19418436 is an apocalyptic number.

It is an amenable number.

19418436 is an abundant number, since it is smaller than the sum of its proper divisors (29667146).

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

19418436 is a wasteful number, since it uses less digits than its factorization.

19418436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539411 (or 539406 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 19418436 is about 4406.6354512258. The cubic root of 19418436 is about 268.7848272154.

The spelling of 19418436 in words is "nineteen million, four hundred eighteen thousand, four hundred thirty-six".