140809421 has 2 divisors, whose sum is σ = 140809422. Its totient is φ = 140809420.

The previous prime is 140809397. The next prime is 140809423. The reversal of 140809421 is 124908041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130279396 + 10530025 = 11414^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 140809421 - 2²² = 136615117 is a prime.

Together with 140809423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140809423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70404710 + 70404711.

It is an arithmetic number, because the mean of its divisors is an integer number (70404711).

Almost surely, 2^140809421 is an apocalyptic number.

It is an amenable number.

140809421 is a deficient number, since it is larger than the sum of its proper divisors (1).

140809421 is an equidigital number, since it uses as much as digits as its factorization.

140809421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 140809421 is about 11866.3145500193. The cubic root of 140809421 is about 520.2481815803.

The spelling of 140809421 in words is "one hundred forty million, eight hundred nine thousand, four hundred twenty-one".