140355257 has 14 divisors (see below), whose sum is σ = 163884858. Its totient is φ = 120203664.

The previous prime is 140355253. The next prime is 140355307. The reversal of 140355257 is 752553041.

It can be written as a sum of positive squares in only one way, i.e., 120472576 + 19882681 = 10976^2 + 4459^2 .

It is not a de Polignac number, because 140355257 - 2² = 140355253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140355253) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 117053 + ... + 118245.

Almost surely, 2^140355257 is an apocalyptic number.

It is an amenable number.

140355257 is a deficient number, since it is larger than the sum of its proper divisors (23529601).

140355257 is an frugal number, since it uses more digits than its factorization.

140355257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1200 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 140355257 is about 11847.1624028710. The cubic root of 140355257 is about 519.6882463182.

The spelling of 140355257 in words is "one hundred forty million, three hundred fifty-five thousand, two hundred fifty-seven".