153640 has 32 divisors (see below), whose sum is σ = 362880. Its totient is φ = 58432.

The previous prime is 153623. The next prime is 153641. The reversal of 153640 is 46351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153641) by changing a digit.

153640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (11340).

2¹⁵³⁶⁴⁰ is an apocalyptic number.

153640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 153640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181440).

153640 is an abundant number, since it is smaller than the sum of its proper divisors (209240).

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

153640 is a wasteful number, since it uses less digits than its factorization.

153640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 153640 is about 391.9693865597. The cubic root of 153640 is about 53.5592844430.

Adding to 153640 its reverse (46351), we get a palindrome (199991).

It can be divided in two parts, 15 and 3640, that added together give a triangular number (3655 = T₈₅).

The spelling of 153640 in words is "one hundred fifty-three thousand, six hundred forty".