281398989 has 8 divisors (see below), whose sum is σ = 375423552. Its totient is φ = 187486880.

The previous prime is 281398973. The next prime is 281398991. The reversal of 281398989 is 989893182.

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 281398989 - 2⁴ = 281398973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281398939) 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, 22089 + ... + 32414.

It is an arithmetic number, because the mean of its divisors is an integer number (46927944).

Almost surely, 2^281398989 is an apocalyptic number.

It is an amenable number.

281398989 is a deficient number, since it is larger than the sum of its proper divisors (94024563).

281398989 is a wasteful number, since it uses less digits than its factorization.

281398989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56227.

The product of its digits is 2239488, while the sum is 57.

The square root of 281398989 is about 16774.9512368889. The cubic root of 281398989 is about 655.3010204670.

It can be divided in two parts, 28139 and 8989, that added together give a triangular number (37128 = T₂₇₂).

The spelling of 281398989 in words is "two hundred eighty-one million, three hundred ninety-eight thousand, nine hundred eighty-nine".