140687993 has 2 divisors, whose sum is σ = 140687994. Its totient is φ = 140687992.

The previous prime is 140687983. The next prime is 140688001. The reversal of 140687993 is 399786041.

140687993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140469904 + 218089 = 11852^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 140687993 - 2⁴ = 140687977 is a prime.

It is a super-2 number, since 2×140687993² = 39586222748736098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (140687923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70343996 + 70343997.

It is an arithmetic number, because the mean of its divisors is an integer number (70343997).

Almost surely, 2^140687993 is an apocalyptic number.

It is an amenable number.

140687993 is a deficient number, since it is larger than the sum of its proper divisors (1).

140687993 is an equidigital number, since it uses as much as digits as its factorization.

140687993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 140687993 is about 11861.1969463457. The cubic root of 140687993 is about 520.0985920060.

The spelling of 140687993 in words is "one hundred forty million, six hundred eighty-seven thousand, nine hundred ninety-three".