140172397 has 2 divisors, whose sum is σ = 140172398. Its totient is φ = 140172396.

The previous prime is 140172379. The next prime is 140172401. The reversal of 140172397 is 793271041.

Together with previous prime (140172379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82700836 + 57471561 = 9094^2 + 7581^2 .

It is an emirp because it is prime and its reverse (793271041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140172397 - 2¹⁹ = 139648109 is a prime.

It is a pancake number, because a pancake can be divided into 140172397 parts by 16743 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140172797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70086198 + 70086199.

It is an arithmetic number, because the mean of its divisors is an integer number (70086199).

Almost surely, 2^140172397 is an apocalyptic number.

It is an amenable number.

140172397 is a deficient number, since it is larger than the sum of its proper divisors (1).

140172397 is an equidigital number, since it uses as much as digits as its factorization.

140172397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 140172397 is about 11839.4424277497. The cubic root of 140172397 is about 519.4624585701.

The spelling of 140172397 in words is "one hundred forty million, one hundred seventy-two thousand, three hundred ninety-seven".