981669 has 8 divisors (see below), whose sum is σ = 1409632. Its totient is φ = 604080.

The previous prime is 981653. The next prime is 981683. The reversal of 981669 is 966189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 981669 - 2⁴ = 981653 is a prime.

It is a super-2 number, since 2×981669² = 1927348051122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 25171 = 981669 / (9 + 8 + 1 + 6 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12547 + ... + 12624.

It is an arithmetic number, because the mean of its divisors is an integer number (176204).

2⁹⁸¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

981669 is a deficient number, since it is larger than the sum of its proper divisors (427963).

981669 is a wasteful number, since it uses less digits than its factorization.

981669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25187.

The product of its digits is 23328, while the sum is 39.

The square root of 981669 is about 990.7921073565. The cubic root of 981669 is about 99.3851945556.

The spelling of 981669 in words is "nine hundred eighty-one thousand, six hundred sixty-nine".