19912065 has 16 divisors (see below), whose sum is σ = 32336448. Its totient is φ = 10460736.

The previous prime is 19912033. The next prime is 19912091. The reversal of 19912065 is 56021991.

It is not a de Polignac number, because 19912065 - 2⁵ = 19912033 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8902 + ... + 10911.

It is an arithmetic number, because the mean of its divisors is an integer number (2021028).

Almost surely, 2^19912065 is an apocalyptic number.

19912065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19912065 is a deficient number, since it is larger than the sum of its proper divisors (12424383).

19912065 is a wasteful number, since it uses less digits than its factorization.

19912065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19888.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 19912065 is about 4462.2936927101. The cubic root of 19912065 is about 271.0433566702.

The spelling of 19912065 in words is "nineteen million, nine hundred twelve thousand, sixty-five".