1989129 has 8 divisors (see below), whose sum is σ = 2791840. Its totient is φ = 1256256.

The previous prime is 1989107. The next prime is 1989131. The reversal of 1989129 is 9219891.

It is a happy number.

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

It is not a de Polignac number, because 1989129 - 2¹¹ = 1987081 is a prime.

It is a Duffinian number.

1989129 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1989329) 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, 17392 + ... + 17505.

It is an arithmetic number, because the mean of its divisors is an integer number (348980).

2^1989129 is an apocalyptic number.

1989129 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1989129 is a deficient number, since it is larger than the sum of its proper divisors (802711).

1989129 is a wasteful number, since it uses less digits than its factorization.

1989129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34919.

The product of its digits is 11664, while the sum is 39.

The square root of 1989129 is about 1410.3648464139. The cubic root of 1989129 is about 125.7634134411.

The spelling of 1989129 in words is "one million, nine hundred eighty-nine thousand, one hundred twenty-nine".