140905421 has 2 divisors, whose sum is σ = 140905422. Its totient is φ = 140905420.

The previous prime is 140905409. The next prime is 140905451. The reversal of 140905421 is 124509041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117961321 + 22944100 = 10861^2 + 4790^2 .

It is a cyclic number.

It is not a de Polignac number, because 140905421 - 2¹⁰ = 140904397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140905451) 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 as a sum of consecutive naturals, namely, 70452710 + 70452711.

It is an arithmetic number, because the mean of its divisors is an integer number (70452711).

Almost surely, 2^140905421 is an apocalyptic number.

It is an amenable number.

140905421 is a deficient number, since it is larger than the sum of its proper divisors (1).

140905421 is an equidigital number, since it uses as much as digits as its factorization.

140905421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 140905421 is about 11870.3589246492. The cubic root of 140905421 is about 520.3663850340.

The spelling of 140905421 in words is "one hundred forty million, nine hundred five thousand, four hundred twenty-one".