140531640 has 64 divisors (see below), whose sum is σ = 422876160. Its totient is φ = 37361280.

The previous prime is 140531621. The next prime is 140531681. The reversal of 140531640 is 46135041.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 140531640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42445 + ... + 45635.

It is an arithmetic number, because the mean of its divisors is an integer number (6607440).

Almost surely, 2^140531640 is an apocalyptic number.

140531640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140531640 is an abundant number, since it is smaller than the sum of its proper divisors (282344520).

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

140531640 is a wasteful number, since it uses less digits than its factorization.

140531640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3572 (or 3568 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 140531640 is about 11854.6041688451. The cubic root of 140531640 is about 519.9058508048.

Adding to 140531640 its reverse (46135041), we get a palindrome (186666681).

The spelling of 140531640 in words is "one hundred forty million, five hundred thirty-one thousand, six hundred forty".