134640 has 120 divisors (see below), whose sum is σ = 522288. Its totient is φ = 30720.

The previous prime is 134639. The next prime is 134669. The reversal of 134640 is 46431.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-3 number, since 3×134640³ = 7322233324032000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7912 + ... + 7928.

2¹³⁴⁶⁴⁰ is an apocalyptic number.

134640 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 134640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261144).

134640 is an abundant number, since it is smaller than the sum of its proper divisors (387648).

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

134640 is a wasteful number, since it uses less digits than its factorization.

134640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 134640 is about 366.9332364341. The cubic root of 134640 is about 51.2536384488.

Subtracting from 134640 its reverse (46431), we obtain a square (88209 = 297²).

The spelling of 134640 in words is "one hundred thirty-four thousand, six hundred forty".