1989567 has 24 divisors (see below), whose sum is σ = 3027024. Its totient is φ = 1257984.

The previous prime is 1989563. The next prime is 1989571. The reversal of 1989567 is 7659891.

1989567 is a `hidden beast` number, since 1 + 9 + 89 + 567 = 666.

It is an interprime number because it is at equal distance from previous prime (1989563) and next prime (1989571).

It is not a de Polignac number, because 1989567 - 2² = 1989563 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20463 + ... + 20559.

It is an arithmetic number, because the mean of its divisors is an integer number (126126).

2^1989567 is an apocalyptic number.

1989567 is a deficient number, since it is larger than the sum of its proper divisors (1037457).

1989567 is a wasteful number, since it uses less digits than its factorization.

1989567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 196 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 1989567 is about 1410.5201168363. The cubic root of 1989567 is about 125.7726436674.

It can be divided in two parts, 1989 and 567, that added together give a triangular number (2556 = T₇₁).

The spelling of 1989567 in words is "one million, nine hundred eighty-nine thousand, five hundred sixty-seven".