140728213 has 4 divisors (see below), whose sum is σ = 145580940. Its totient is φ = 135875488.

The previous prime is 140728183. The next prime is 140728241. The reversal of 140728213 is 312827041.

140728213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312827041 = 53 ⋅5902397.

It can be written as a sum of positive squares in 2 ways, for example, as 57426084 + 83302129 = 7578^2 + 9127^2 .

It is a cyclic number.

It is not a de Polignac number, because 140728213 - 2¹⁷ = 140597141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140728613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2426320 + ... + 2426377.

It is an arithmetic number, because the mean of its divisors is an integer number (36395235).

Almost surely, 2^140728213 is an apocalyptic number.

It is an amenable number.

140728213 is a deficient number, since it is larger than the sum of its proper divisors (4852727).

140728213 is an equidigital number, since it uses as much as digits as its factorization.

140728213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4852726.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 140728213 is about 11862.8922695943. The cubic root of 140728213 is about 520.1481493559.

The spelling of 140728213 in words is "one hundred forty million, seven hundred twenty-eight thousand, two hundred thirteen".