140404657 has 2 divisors, whose sum is σ = 140404658. Its totient is φ = 140404656.

The previous prime is 140404619. The next prime is 140404681. The reversal of 140404657 is 756404041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104775696 + 35628961 = 10236^2 + 5969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140404657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140404697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70202328 + 70202329.

It is an arithmetic number, because the mean of its divisors is an integer number (70202329).

Almost surely, 2^140404657 is an apocalyptic number.

It is an amenable number.

140404657 is a deficient number, since it is larger than the sum of its proper divisors (1).

140404657 is an equidigital number, since it uses as much as digits as its factorization.

140404657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 140404657 is about 11849.2471068840. The cubic root of 140404657 is about 519.7492096873.

Adding to 140404657 its reverse (756404041), we get a palindrome (896808698).

The spelling of 140404657 in words is "one hundred forty million, four hundred four thousand, six hundred fifty-seven".