140402257 has 2 divisors, whose sum is σ = 140402258. Its totient is φ = 140402256.

The previous prime is 140402239. The next prime is 140402279. The reversal of 140402257 is 752204041.

140402257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139145616 + 1256641 = 11796^2 + 1121^2 .

It is a cyclic number.

It is not a de Polignac number, because 140402257 - 2²³ = 132013649 is a prime.

It is not a weakly prime, because it can be changed into another prime (140402357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70201128 + 70201129.

It is an arithmetic number, because the mean of its divisors is an integer number (70201129).

Almost surely, 2^140402257 is an apocalyptic number.

It is an amenable number.

140402257 is a deficient number, since it is larger than the sum of its proper divisors (1).

140402257 is an equidigital number, since it uses as much as digits as its factorization.

140402257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 140402257 is about 11849.1458341941. The cubic root of 140402257 is about 519.7462482347.

Adding to 140402257 its reverse (752204041), we get a palindrome (892606298).

The spelling of 140402257 in words is "one hundred forty million, four hundred two thousand, two hundred fifty-seven".