140681440 has 24 divisors (see below), whose sum is σ = 332360280. Its totient is φ = 56272512.

The previous prime is 140681419. The next prime is 140681447. The reversal of 140681440 is 44186041.

140681440 = 1451² + 1452² + ... + 1514².

It is a junction number, because it is equal to n+sod(n) for n = 140681399 and 140681408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140681447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439470 + ... + 439789.

It is an arithmetic number, because the mean of its divisors is an integer number (13848345).

Almost surely, 2^140681440 is an apocalyptic number.

140681440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140681440 is an abundant number, since it is smaller than the sum of its proper divisors (191678840).

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

140681440 is an equidigital number, since it uses as much as digits as its factorization.

140681440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879274 (or 879266 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 140681440 is about 11860.9207062521. The cubic root of 140681440 is about 520.0905167871.

The spelling of 140681440 in words is "one hundred forty million, six hundred eighty-one thousand, four hundred forty".