19908961 has 8 divisors (see below), whose sum is σ = 21026880. Its totient is φ = 18812112.

The previous prime is 19908953. The next prime is 19909061. The reversal of 19908961 is 16980991.

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 19908961 - 2³ = 19908953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19905961) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3306 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (2628360).

Almost surely, 2^19908961 is an apocalyptic number.

It is an amenable number.

19908961 is a deficient number, since it is larger than the sum of its proper divisors (1117919).

19908961 is a wasteful number, since it uses less digits than its factorization.

19908961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10535.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 19908961 is about 4461.9458759604. The cubic root of 19908961 is about 271.0292720386.

The spelling of 19908961 in words is "nineteen million, nine hundred eight thousand, nine hundred sixty-one".