19965049 has 4 divisors (see below), whose sum is σ = 21500836. Its totient is φ = 18429264.

The previous prime is 19965041. The next prime is 19965053. The reversal of 19965049 is 94056991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3097600 + 16867449 = 1760^2 + 4107^2 .

It is a cyclic number.

It is not a de Polignac number, because 19965049 - 2³ = 19965041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19964996 and 19965014.

It is not an unprimeable number, because it can be changed into a prime (19965041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 767874 + ... + 767899.

It is an arithmetic number, because the mean of its divisors is an integer number (5375209).

Almost surely, 2^19965049 is an apocalyptic number.

It is an amenable number.

19965049 is a deficient number, since it is larger than the sum of its proper divisors (1535787).

19965049 is a wasteful number, since it uses less digits than its factorization.

19965049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535786.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 19965049 is about 4468.2266057128. The cubic root of 19965049 is about 271.2835501126.

The spelling of 19965049 in words is "nineteen million, nine hundred sixty-five thousand, forty-nine".