19472805 has 96 divisors (see below), whose sum is σ = 40255488. Its totient is φ = 8942400.

The previous prime is 19472801. The next prime is 19472819. The reversal of 19472805 is 50827491.

It is not a de Polignac number, because 19472805 - 2² = 19472801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19472805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19472801) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 414292 + ... + 414338.

It is an arithmetic number, because the mean of its divisors is an integer number (419328).

Almost surely, 2^19472805 is an apocalyptic number.

19472805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19472805 is an abundant number, since it is smaller than the sum of its proper divisors (20782683).

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

19472805 is a wasteful number, since it uses less digits than its factorization.

19472805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 19472805 is about 4412.8001314358. The cubic root of 19472805 is about 269.0354472066.

The spelling of 19472805 in words is "nineteen million, four hundred seventy-two thousand, eight hundred five".