981815 has 8 divisors (see below), whose sum is σ = 1185840. Its totient is φ = 780352.

The previous prime is 981811. The next prime is 981817. The reversal of 981815 is 518189.

It is a happy number.

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 981815 - 2² = 981811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981811) 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, 347 + ... + 1443.

It is an arithmetic number, because the mean of its divisors is an integer number (148230).

2⁹⁸¹⁸¹⁵ is an apocalyptic number.

981815 is a deficient number, since it is larger than the sum of its proper divisors (204025).

981815 is a wasteful number, since it uses less digits than its factorization.

981815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281.

The product of its digits is 2880, while the sum is 32.

The square root of 981815 is about 990.8657830403. The cubic root of 981815 is about 99.3901213755.

The spelling of 981815 in words is "nine hundred eighty-one thousand, eight hundred fifteen".