140821393 has 2 divisors, whose sum is σ = 140821394. Its totient is φ = 140821392.

The previous prime is 140821379. The next prime is 140821403. The reversal of 140821393 is 393128041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118984464 + 21836929 = 10908^2 + 4673^2 .

It is a cyclic number.

It is not a de Polignac number, because 140821393 - 2¹⁷ = 140690321 is a prime.

It is not a weakly prime, because it can be changed into another prime (140821363) 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, 70410696 + 70410697.

It is an arithmetic number, because the mean of its divisors is an integer number (70410697).

Almost surely, 2^140821393 is an apocalyptic number.

It is an amenable number.

140821393 is a deficient number, since it is larger than the sum of its proper divisors (1).

140821393 is an equidigital number, since it uses as much as digits as its factorization.

140821393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 140821393 is about 11866.8189924680. The cubic root of 140821393 is about 520.2629254676.

It can be divided in two parts, 1408 and 21393, that added together give a square (22801 = 151²).

The spelling of 140821393 in words is "one hundred forty million, eight hundred twenty-one thousand, three hundred ninety-three".