140528257 has 8 divisors (see below), whose sum is σ = 147684416. Its totient is φ = 133548912.

The previous prime is 140528251. The next prime is 140528263. The reversal of 140528257 is 752825041.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (140528251) and next prime (140528263).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 140528257 - 2³ = 140528249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140528251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42573 + ... + 45754.

It is an arithmetic number, because the mean of its divisors is an integer number (18460552).

Almost surely, 2^140528257 is an apocalyptic number.

It is an amenable number.

140528257 is a deficient number, since it is larger than the sum of its proper divisors (7156159).

140528257 is an equidigital number, since it uses as much as digits as its factorization.

140528257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88407.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 140528257 is about 11854.4614808097. The cubic root of 140528257 is about 519.9016788959.

The spelling of 140528257 in words is "one hundred forty million, five hundred twenty-eight thousand, two hundred fifty-seven".