140393657 has 2 divisors, whose sum is σ = 140393658. Its totient is φ = 140393656.

The previous prime is 140393647. The next prime is 140393663. The reversal of 140393657 is 756393041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126585001 + 13808656 = 11251^2 + 3716^2 .

It is an emirp because it is prime and its reverse (756393041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140393657 - 2⁶ = 140393593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140393657.

It is not a weakly prime, because it can be changed into another prime (140393647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70196828 + 70196829.

It is an arithmetic number, because the mean of its divisors is an integer number (70196829).

Almost surely, 2^140393657 is an apocalyptic number.

It is an amenable number.

140393657 is a deficient number, since it is larger than the sum of its proper divisors (1).

140393657 is an equidigital number, since it uses as much as digits as its factorization.

140393657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 140393657 is about 11848.7829332805. The cubic root of 140393657 is about 519.7356360858.

The spelling of 140393657 in words is "one hundred forty million, three hundred ninety-three thousand, six hundred fifty-seven".