981915 has 24 divisors (see below), whose sum is σ = 1730064. Its totient is φ = 475200.

The previous prime is 981913. The next prime is 981919. The reversal of 981915 is 519189.

981915 = T₁₈₆ + T₁₈₇ + ... + T₂₃₀.

It is not a de Polignac number, because 981915 - 2¹ = 981913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (981913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1545 + ... + 2085.

It is an arithmetic number, because the mean of its divisors is an integer number (72086).

2⁹⁸¹⁹¹⁵ is an apocalyptic number.

981915 is a deficient number, since it is larger than the sum of its proper divisors (748149).

981915 is a wasteful number, since it uses less digits than its factorization.

981915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 560 counting only the distinct ones).

The product of its digits is 3240, while the sum is 33.

The square root of 981915 is about 990.9162426764. The cubic root of 981915 is about 99.3934956278.

The spelling of 981915 in words is "nine hundred eighty-one thousand, nine hundred fifteen".