140405836 has 24 divisors (see below), whose sum is σ = 252338240. Its totient is φ = 68321232.

The previous prime is 140405833. The next prime is 140405887. The reversal of 140405836 is 638504041.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 140405798 and 140405807.

It is not an unprimeable number, because it can be changed into a prime (140405833) 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 7 ways as a sum of consecutive naturals, for example, 51475 + ... + 54133.

Almost surely, 2^140405836 is an apocalyptic number.

It is an amenable number.

140405836 is a deficient number, since it is larger than the sum of its proper divisors (111932404).

140405836 is a wasteful number, since it uses less digits than its factorization.

140405836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013 (or 3011 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 140405836 is about 11849.2968567759. The cubic root of 140405836 is about 519.7506644886.

Adding to 140405836 its reverse (638504041), we get a palindrome (778909877).

The spelling of 140405836 in words is "one hundred forty million, four hundred five thousand, eight hundred thirty-six".