140644 has 12 divisors (see below), whose sum is σ = 281344. Its totient is φ = 60264.

The previous prime is 140639. The next prime is 140659. The reversal of 140644 is 446041.

140644 is an admirable number.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 2484 + ... + 2539.

2¹⁴⁰⁶⁴⁴ is an apocalyptic number.

140644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

140644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

140644 is a wasteful number, since it uses less digits than its factorization.

140644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5034 (or 5032 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 140644 is about 375.0253324777. The cubic root of 140644 is about 52.0044374911.

Subtracting from 140644 its sum of digits (19), we obtain a square (140625 = 375²).

Adding to 140644 its reverse (446041), we get a palindrome (586685).

It can be divided in two parts, 140 and 644, that added together give a square (784 = 28²).

The spelling of 140644 in words is "one hundred forty thousand, six hundred forty-four".