140428391 has 2 divisors, whose sum is σ = 140428392. Its totient is φ = 140428390.

The previous prime is 140428369. The next prime is 140428397. The reversal of 140428391 is 193824041.

It is a happy number.

140428391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 140428391 - 2²⁶ = 73319527 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140428397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70214195 + 70214196.

It is an arithmetic number, because the mean of its divisors is an integer number (70214196).

Almost surely, 2^140428391 is an apocalyptic number.

140428391 is a deficient number, since it is larger than the sum of its proper divisors (1).

140428391 is an equidigital number, since it uses as much as digits as its factorization.

140428391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 140428391 is about 11850.2485627939. The cubic root of 140428391 is about 519.7784941688.

The spelling of 140428391 in words is "one hundred forty million, four hundred twenty-eight thousand, three hundred ninety-one".