140193821 has 2 divisors, whose sum is σ = 140193822. Its totient is φ = 140193820.

The previous prime is 140193793. The next prime is 140193829. The reversal of 140193821 is 128391041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 8265625 = 11486^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 140193821 - 2¹⁴ = 140177437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140193829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70096910 + 70096911.

It is an arithmetic number, because the mean of its divisors is an integer number (70096911).

Almost surely, 2^140193821 is an apocalyptic number.

It is an amenable number.

140193821 is a deficient number, since it is larger than the sum of its proper divisors (1).

140193821 is an equidigital number, since it uses as much as digits as its factorization.

140193821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 140193821 is about 11840.3471655184. The cubic root of 140193821 is about 519.4889221655.

The spelling of 140193821 in words is "one hundred forty million, one hundred ninety-three thousand, eight hundred twenty-one".