140509399 has 4 divisors (see below), whose sum is σ = 140533264. Its totient is φ = 140485536.

The previous prime is 140509363. The next prime is 140509409. The reversal of 140509399 is 993905041.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 140509399 - 2⁹ = 140508887 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 (140509339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3919 + ... + 17215.

It is an arithmetic number, because the mean of its divisors is an integer number (35133316).

Almost surely, 2^140509399 is an apocalyptic number.

140509399 is a deficient number, since it is larger than the sum of its proper divisors (23865).

140509399 is a wasteful number, since it uses less digits than its factorization.

140509399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23864.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 140509399 is about 11853.6660573849. Note that the first 3 decimals coincide. The cubic root of 140509399 is about 519.8784220206.

The spelling of 140509399 in words is "one hundred forty million, five hundred nine thousand, three hundred ninety-nine".