19836961 has 4 divisors (see below), whose sum is σ = 20259072. Its totient is φ = 19414852.

The previous prime is 19836941. The next prime is 19836967. The reversal of 19836961 is 16963891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16963891 = 7 ⋅2423413.

It is a cyclic number.

It is not a de Polignac number, because 19836961 - 2¹³ = 19828769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19836967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210985 + ... + 211078.

It is an arithmetic number, because the mean of its divisors is an integer number (5064768).

Almost surely, 2^19836961 is an apocalyptic number.

It is an amenable number.

19836961 is a deficient number, since it is larger than the sum of its proper divisors (422111).

19836961 is an equidigital number, since it uses as much as digits as its factorization.

19836961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422110.

The product of its digits is 69984, while the sum is 43.

The square root of 19836961 is about 4453.8703393790. The cubic root of 19836961 is about 270.7021550354.

The spelling of 19836961 in words is "nineteen million, eight hundred thirty-six thousand, nine hundred sixty-one".