140236405 has 32 divisors (see below), whose sum is σ = 183214080. Its totient is φ = 102738240.

The previous prime is 140236403. The next prime is 140236423. The reversal of 140236405 is 504632041.

It is not a de Polignac number, because 140236405 - 2¹ = 140236403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140236405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140236403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495394 + ... + 495676.

It is an arithmetic number, because the mean of its divisors is an integer number (5725440).

Almost surely, 2^140236405 is an apocalyptic number.

It is an amenable number.

140236405 is a deficient number, since it is larger than the sum of its proper divisors (42977675).

140236405 is a wasteful number, since it uses less digits than its factorization.

140236405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 140236405 is about 11842.1452870669. The cubic root of 140236405 is about 519.5415152508.

Adding to 140236405 its reverse (504632041), we get a palindrome (644868446).

The spelling of 140236405 in words is "one hundred forty million, two hundred thirty-six thousand, four hundred five".