140106640 has 20 divisors (see below), whose sum is σ = 325748124. Its totient is φ = 56042624.

The previous prime is 140106623. The next prime is 140106647. The reversal of 140106640 is 46601041.

It can be written as a sum of positive squares in 2 ways, for example, as 16096144 + 124010496 = 4012^2 + 11136^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (140106647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875587 + ... + 875746.

Almost surely, 2^140106640 is an apocalyptic number.

140106640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140106640 is an abundant number, since it is smaller than the sum of its proper divisors (185641484).

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

140106640 is a wasteful number, since it uses less digits than its factorization.

140106640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751346 (or 1751340 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 140106640 is about 11836.6650708719. The cubic root of 140106640 is about 519.3812166224.

Adding to 140106640 its reverse (46601041), we get a palindrome (186707681).

The spelling of 140106640 in words is "one hundred forty million, one hundred six thousand, six hundred forty".