140408251 has 4 divisors (see below), whose sum is σ = 142385904. Its totient is φ = 138430600.

The previous prime is 140408243. The next prime is 140408267. The reversal of 140408251 is 152804041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 140408251 - 2³ = 140408243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140408291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988720 + ... + 988861.

It is an arithmetic number, because the mean of its divisors is an integer number (35596476).

Almost surely, 2^140408251 is an apocalyptic number.

140408251 is a deficient number, since it is larger than the sum of its proper divisors (1977653).

140408251 is an equidigital number, since it uses as much as digits as its factorization.

140408251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977652.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 140408251 is about 11849.3987611186. The cubic root of 140408251 is about 519.7536443995.

The spelling of 140408251 in words is "one hundred forty million, four hundred eight thousand, two hundred fifty-one".