156009 has 32 divisors (see below), whose sum is σ = 276480. Its totient is φ = 76032.

The previous prime is 156007. The next prime is 156011. The reversal of 156009 is 900651.

It is an interprime number because it is at equal distance from previous prime (156007) and next prime (156011).

It is not a de Polignac number, because 156009 - 2¹ = 156007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

156009 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 156009.

It is not an unprimeable number, because it can be changed into a prime (156007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6772 + ... + 6794.

It is an arithmetic number, because the mean of its divisors is an integer number (8640).

2¹⁵⁶⁰⁰⁹ is an apocalyptic number.

156009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

156009 is a deficient number, since it is larger than the sum of its proper divisors (120471).

156009 is a wasteful number, since it uses less digits than its factorization.

156009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 156009 is about 394.9797463162. The cubic root of 156009 is about 53.8331613342.

The spelling of 156009 in words is "one hundred fifty-six thousand, nine".