140128509 has 8 divisors (see below), whose sum is σ = 191887840. Its totient is φ = 90894096.

The previous prime is 140128459. The next prime is 140128543. The reversal of 140128509 is 905821041.

It is a happy number.

140128509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 140128509 - 2⁸ = 140128253 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 (140128579) 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, 631099 + ... + 631320.

It is an arithmetic number, because the mean of its divisors is an integer number (23985980).

Almost surely, 2^140128509 is an apocalyptic number.

It is an amenable number.

140128509 is a deficient number, since it is larger than the sum of its proper divisors (51759331).

140128509 is a wasteful number, since it uses less digits than its factorization.

140128509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262459.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 140128509 is about 11837.5888169846. The cubic root of 140128509 is about 519.4082383179.

The spelling of 140128509 in words is "one hundred forty million, one hundred twenty-eight thousand, five hundred nine".