140005623 has 32 divisors (see below), whose sum is σ = 206323200. Its totient is φ = 84053376.

The previous prime is 140005601. The next prime is 140005637. The reversal of 140005623 is 326500041.

It is a happy number.

It is not a de Polignac number, because 140005623 - 2⁹ = 140005111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140005623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140005123) 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 31 ways as a sum of consecutive naturals, for example, 352461 + ... + 352857.

It is an arithmetic number, because the mean of its divisors is an integer number (6447600).

Almost surely, 2^140005623 is an apocalyptic number.

140005623 is a deficient number, since it is larger than the sum of its proper divisors (66317577).

140005623 is a wasteful number, since it uses less digits than its factorization.

140005623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 140005623 is about 11832.3971789321. The cubic root of 140005623 is about 519.2563618526.

Adding to 140005623 its reverse (326500041), we get a palindrome (466505664).

The spelling of 140005623 in words is "one hundred forty million, five thousand, six hundred twenty-three".