19085989 has 8 divisors (see below), whose sum is σ = 20942712. Its totient is φ = 17284800.

The previous prime is 19085981. The next prime is 19085999. The reversal of 19085989 is 98958091.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1361889 + 17724100 = 1167^2 + 4210^2 .

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

It is not a de Polignac number, because 19085989 - 2³ = 19085981 is a prime.

It is a super-2 number, since 2×19085989² = 728549952216242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19085981) 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, 13162 + ... + 14539.

It is an arithmetic number, because the mean of its divisors is an integer number (2617839).

Almost surely, 2^19085989 is an apocalyptic number.

It is an amenable number.

19085989 is a deficient number, since it is larger than the sum of its proper divisors (1856723).

19085989 is a wasteful number, since it uses less digits than its factorization.

19085989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27767.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 19085989 is about 4368.7514234619. The cubic root of 19085989 is about 267.2421085719.

The spelling of 19085989 in words is "nineteen million, eighty-five thousand, nine hundred eighty-nine".