19380865 has 16 divisors (see below), whose sum is σ = 26756352. Its totient is φ = 13201344.

The previous prime is 19380857. The next prime is 19380869. The reversal of 19380865 is 56808391.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19380865 - 2³ = 19380857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19380869) 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, 3732 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (1672272).

Almost surely, 2^19380865 is an apocalyptic number.

It is an amenable number.

19380865 is a deficient number, since it is larger than the sum of its proper divisors (7375487).

19380865 is a wasteful number, since it uses less digits than its factorization.

19380865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 19380865 is about 4402.3703842362. The cubic root of 19380865 is about 268.6113660321.

The spelling of 19380865 in words is "nineteen million, three hundred eighty thousand, eight hundred sixty-five".