1989355 has 8 divisors (see below), whose sum is σ = 2432592. Its totient is φ = 1561248.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989355 is 5539891.

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

It is a cyclic number.

It is not a de Polignac number, because 1989355 - 2¹ = 1989353 is a prime.

It is a Duffinian number.

1989355 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1989353) 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, 3489 + ... + 4018.

It is an arithmetic number, because the mean of its divisors is an integer number (304074).

2^1989355 is an apocalyptic number.

1989355 is a deficient number, since it is larger than the sum of its proper divisors (443237).

1989355 is an equidigital number, since it uses as much as digits as its factorization.

1989355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7565.

The product of its digits is 48600, while the sum is 40.

The square root of 1989355 is about 1410.4449652503. Note that the first 3 decimals coincide. The cubic root of 1989355 is about 125.7681762385.

The spelling of 1989355 in words is "one million, nine hundred eighty-nine thousand, three hundred fifty-five".