140005440 has 168 divisors, whose sum is σ = 486067608. Its totient is φ = 36986880.

The previous prime is 140005409. The next prime is 140005451. The reversal of 140005440 is 44500041.

It can be written as a sum of positive squares in 4 ways, for example, as 51494976 + 88510464 = 7176^2 + 9408^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 498100 + ... + 498380.

Almost surely, 2^140005440 is an apocalyptic number.

140005440 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 140005440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243033804).

140005440 is an abundant number, since it is smaller than the sum of its proper divisors (346062168).

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

140005440 is a wasteful number, since it uses less digits than its factorization.

140005440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 140005440 is about 11832.3894459234. The cubic root of 140005440 is about 519.2561356142.

Adding to 140005440 its reverse (44500041), we get a palindrome (184505481).

The spelling of 140005440 in words is "one hundred forty million, five thousand, four hundred forty".