1989281 has 8 divisors (see below), whose sum is σ = 2393280. Its totient is φ = 1615248.

The previous prime is 1989277. The next prime is 1989307. The reversal of 1989281 is 1829891.

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 1989281 - 2² = 1989277 is a prime.

It is a super-2 number, since 2×1989281² = 7914477793922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7346 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (299160).

2^1989281 is an apocalyptic number.

It is an amenable number.

1989281 is a deficient number, since it is larger than the sum of its proper divisors (403999).

1989281 is a wasteful number, since it uses less digits than its factorization.

1989281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14983.

The product of its digits is 10368, while the sum is 38.

The square root of 1989281 is about 1410.4187321501. The cubic root of 1989281 is about 125.7666167782.

The spelling of 1989281 in words is "one million, nine hundred eighty-nine thousand, two hundred eighty-one".