140445391 has 2 divisors, whose sum is σ = 140445392. Its totient is φ = 140445390.

The previous prime is 140445373. The next prime is 140445433. The reversal of 140445391 is 193544041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140445391 - 2⁹ = 140444879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140445091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70222695 + 70222696.

It is an arithmetic number, because the mean of its divisors is an integer number (70222696).

Almost surely, 2^140445391 is an apocalyptic number.

140445391 is a deficient number, since it is larger than the sum of its proper divisors (1).

140445391 is an equidigital number, since it uses as much as digits as its factorization.

140445391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 140445391 is about 11850.9658256194. The cubic root of 140445391 is about 519.7994677953.

The spelling of 140445391 in words is "one hundred forty million, four hundred forty-five thousand, three hundred ninety-one".