140421636 has 36 divisors (see below), whose sum is σ = 355364464. Its totient is φ = 46753200.

The previous prime is 140421629. The next prime is 140421653. The reversal of 140421636 is 636124041.

140421636 is a `hidden beast` number, since 1 + 4 + 0 + 4 + 21 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40491 + ... + 43821.

Almost surely, 2^140421636 is an apocalyptic number.

It is an amenable number.

140421636 is an abundant number, since it is smaller than the sum of its proper divisors (214942828).

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

140421636 is a wasteful number, since it uses less digits than its factorization.

140421636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512 (or 4507 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 140421636 is about 11849.9635442477. The cubic root of 140421636 is about 519.7701597667.

Adding to 140421636 its reverse (636124041), we get a palindrome (776545677).

The spelling of 140421636 in words is "one hundred forty million, four hundred twenty-one thousand, six hundred thirty-six".