19490565 has 16 divisors (see below), whose sum is σ = 31625856. Its totient is φ = 10248000.

The previous prime is 19490543. The next prime is 19490609. The reversal of 19490565 is 56509491.

It is not a de Polignac number, because 19490565 - 2⁷ = 19490437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8086 + ... + 10215.

It is an arithmetic number, because the mean of its divisors is an integer number (1976616).

Almost surely, 2^19490565 is an apocalyptic number.

19490565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19490565 is a deficient number, since it is larger than the sum of its proper divisors (12135291).

19490565 is a wasteful number, since it uses less digits than its factorization.

19490565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18380.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 19490565 is about 4414.8120005273. The cubic root of 19490565 is about 269.1172128225.

The spelling of 19490565 in words is "nineteen million, four hundred ninety thousand, five hundred sixty-five".