140536421 has 2 divisors, whose sum is σ = 140536422. Its totient is φ = 140536420.

The previous prime is 140536391. The next prime is 140536441. The reversal of 140536421 is 124635041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121308196 + 19228225 = 11014^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 140536421 - 2¹⁰ = 140535397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140536441) by changing a digit.

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 as a sum of consecutive naturals, namely, 70268210 + 70268211.

It is an arithmetic number, because the mean of its divisors is an integer number (70268211).

Almost surely, 2^140536421 is an apocalyptic number.

It is an amenable number.

140536421 is a deficient number, since it is larger than the sum of its proper divisors (1).

140536421 is an equidigital number, since it uses as much as digits as its factorization.

140536421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 140536421 is about 11854.8058187387. The cubic root of 140536421 is about 519.9117466104.

The spelling of 140536421 in words is "one hundred forty million, five hundred thirty-six thousand, four hundred twenty-one".