19888961 has 8 divisors (see below), whose sum is σ = 20236800. Its totient is φ = 19543680.

The previous prime is 19888927. The next prime is 19888969. The reversal of 19888961 is 16988891.

It is a happy number.

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 19888961 - 2¹⁰ = 19887937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19888969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20945 + ... + 21873.

It is an arithmetic number, because the mean of its divisors is an integer number (2529600).

Almost surely, 2^19888961 is an apocalyptic number.

It is an amenable number.

19888961 is a deficient number, since it is larger than the sum of its proper divisors (347839).

19888961 is an equidigital number, since it uses as much as digits as its factorization.

19888961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279.

The product of its digits is 248832, while the sum is 50.

The square root of 19888961 is about 4459.7041381688. The cubic root of 19888961 is about 270.9384854228.

The spelling of 19888961 in words is "nineteen million, eight hundred eighty-eight thousand, nine hundred sixty-one".