140640 has 48 divisors (see below), whose sum is σ = 444528. Its totient is φ = 37376.

The previous prime is 140639. The next prime is 140659. The reversal of 140640 is 46041.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334 + ... + 626.

It is an arithmetic number, because the mean of its divisors is an integer number (9261).

2¹⁴⁰⁶⁴⁰ is an apocalyptic number.

140640 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 140640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222264).

140640 is an abundant number, since it is smaller than the sum of its proper divisors (303888).

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

140640 is a wasteful number, since it uses less digits than its factorization.

140640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 140640 is about 375.0199994667. The cubic root of 140640 is about 52.0039444740.

Subtracting from 140640 its sum of digits (15), we obtain a square (140625 = 375²).

Adding to 140640 its reverse (46041), we get a palindrome (186681).

It can be divided in two parts, 140 and 640, that added together give a triangular number (780 = T₃₉).

The spelling of 140640 in words is "one hundred forty thousand, six hundred forty".