981578 has 16 divisors (see below), whose sum is σ = 1669920. Its totient is φ = 428976.

The previous prime is 981577. The next prime is 981587. The reversal of 981578 is 875189.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (981577) 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, 500 + ... + 1487.

It is an arithmetic number, because the mean of its divisors is an integer number (104370).

2⁹⁸¹⁵⁷⁸ is an apocalyptic number.

981578 is a deficient number, since it is larger than the sum of its proper divisors (688342).

981578 is a wasteful number, since it uses less digits than its factorization.

981578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021.

The product of its digits is 20160, while the sum is 38.

The square root of 981578 is about 990.7461834395. The cubic root of 981578 is about 99.3821234823.

The spelling of 981578 in words is "nine hundred eighty-one thousand, five hundred seventy-eight".