19772089 has 4 divisors (see below), whose sum is σ = 19858660. Its totient is φ = 19685520.

The previous prime is 19772069. The next prime is 19772149. The reversal of 19772089 is 98027791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98027791 = 197 ⋅497603.

It can be written as a sum of positive squares in 2 ways, for example, as 12482089 + 7290000 = 3533^2 + 2700^2 .

It is a cyclic number.

It is not a de Polignac number, because 19772089 - 2⁵ = 19772057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19772029) 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, 42942 + ... + 43399.

It is an arithmetic number, because the mean of its divisors is an integer number (4964665).

Almost surely, 2^19772089 is an apocalyptic number.

It is an amenable number.

19772089 is a deficient number, since it is larger than the sum of its proper divisors (86571).

19772089 is an equidigital number, since it uses as much as digits as its factorization.

19772089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86570.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 19772089 is about 4446.5817208278. The cubic root of 19772089 is about 270.4067440591.

The spelling of 19772089 in words is "nineteen million, seven hundred seventy-two thousand, eighty-nine".