19056989 has 4 divisors (see below), whose sum is σ = 21779424. Its totient is φ = 16334556.

The previous prime is 19056979. The next prime is 19056997. The reversal of 19056989 is 98965091.

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: 98965091 = 19 ⋅5208689.

It is not a de Polignac number, because 19056989 - 2¹² = 19052893 is a prime.

It is a super-2 number, since 2×19056989² = 726337659492242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19056929) 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, 1361207 + ... + 1361220.

It is an arithmetic number, because the mean of its divisors is an integer number (5444856).

Almost surely, 2^19056989 is an apocalyptic number.

It is an amenable number.

19056989 is a deficient number, since it is larger than the sum of its proper divisors (2722435).

19056989 is an equidigital number, since it uses as much as digits as its factorization.

19056989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722434.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 19056989 is about 4365.4311356383. The cubic root of 19056989 is about 267.1066872480.

The spelling of 19056989 in words is "nineteen million, fifty-six thousand, nine hundred eighty-nine".