978009 has 8 divisors (see below), whose sum is σ = 1328832. Its totient is φ = 639600.

The previous prime is 978007. The next prime is 978011. The reversal of 978009 is 900879.

978009 = T₁₆₅ + T₁₆₆ + ... + T₂₁₇.

It is an interprime number because it is at equal distance from previous prime (978007) and next prime (978011).

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

It is not a de Polignac number, because 978009 - 2¹ = 978007 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (978001) 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, 2917 + ... + 3234.

It is an arithmetic number, because the mean of its divisors is an integer number (166104).

2⁹⁷⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

978009 is a deficient number, since it is larger than the sum of its proper divisors (350823).

978009 is a wasteful number, since it uses less digits than its factorization.

978009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6207.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 978009 is about 988.9433755276. The cubic root of 978009 is about 99.2615266620.

The spelling of 978009 in words is "nine hundred seventy-eight thousand, nine".