156840 has 32 divisors (see below), whose sum is σ = 470880. Its totient is φ = 41792.

The previous prime is 156833. The next prime is 156841. The reversal of 156840 is 48651.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 156840.

It is not an unprimeable number, because it can be changed into a prime (156841) by changing a digit.

156840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534 + ... + 773.

It is an arithmetic number, because the mean of its divisors is an integer number (14715).

2¹⁵⁶⁸⁴⁰ is an apocalyptic number.

156840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156840 is an abundant number, since it is smaller than the sum of its proper divisors (314040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

156840 is a wasteful number, since it uses less digits than its factorization.

156840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 156840 is about 396.0303018710. The cubic root of 156840 is about 53.9285749790.

Subtracting from 156840 its sum of digits (24), we obtain a square (156816 = 396²).

The spelling of 156840 in words is "one hundred fifty-six thousand, eight hundred forty".