19661039 has 8 divisors (see below), whose sum is σ = 20103120. Its totient is φ = 19221696.

The previous prime is 19661009. The next prime is 19661051. The reversal of 19661039 is 93016691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19661039 - 2²⁴ = 2883823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19661009) 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 7 ways as a sum of consecutive naturals, for example, 21224 + ... + 22130.

It is an arithmetic number, because the mean of its divisors is an integer number (2512890).

Almost surely, 2^19661039 is an apocalyptic number.

19661039 is a deficient number, since it is larger than the sum of its proper divisors (442081).

19661039 is an equidigital number, since it uses as much as digits as its factorization.

19661039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 19661039 is about 4434.0770178246. The cubic root of 19661039 is about 269.8995465358.

The spelling of 19661039 in words is "nineteen million, six hundred sixty-one thousand, thirty-nine".