1989123 has 8 divisors (see below), whose sum is σ = 2670336. Its totient is φ = 1317000.

The previous prime is 1989107. The next prime is 1989131. The reversal of 1989123 is 3219891.

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

It is not a de Polignac number, because 1989123 - 2⁴ = 1989107 is a prime.

It is a super-2 number, since 2×1989123² = 7913220618258, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1989133) 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, 1743 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (333792).

2^1989123 is an apocalyptic number.

1989123 is a deficient number, since it is larger than the sum of its proper divisors (681213).

1989123 is a wasteful number, since it uses less digits than its factorization.

1989123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545.

The product of its digits is 3888, while the sum is 33.

The square root of 1989123 is about 1410.3627193031. The cubic root of 1989123 is about 125.7632869902.

It can be divided in two parts, 1989 and 123, that added together give a palindrome (2112).

The spelling of 1989123 in words is "one million, nine hundred eighty-nine thousand, one hundred twenty-three".