140723257 has 4 divisors (see below), whose sum is σ = 140792400. Its totient is φ = 140654116.

The previous prime is 140723243. The next prime is 140723267. The reversal of 140723257 is 752327041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752327041 = 211 ⋅3565531.

It is a cyclic number.

It is not a de Polignac number, because 140723257 - 2¹⁵ = 140690489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140723227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31423 + ... + 35620.

It is an arithmetic number, because the mean of its divisors is an integer number (35198100).

Almost surely, 2^140723257 is an apocalyptic number.

It is an amenable number.

140723257 is a deficient number, since it is larger than the sum of its proper divisors (69143).

140723257 is an equidigital number, since it uses as much as digits as its factorization.

140723257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69142.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 140723257 is about 11862.6833810905. The cubic root of 140723257 is about 520.1420432965.

The spelling of 140723257 in words is "one hundred forty million, seven hundred twenty-three thousand, two hundred fifty-seven".