140243421 has 16 divisors (see below), whose sum is σ = 198241344. Its totient is φ = 87884544.

The previous prime is 140243417. The next prime is 140243437. The reversal of 140243421 is 124342041.

It is not a de Polignac number, because 140243421 - 2² = 140243417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140243401) 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 15 ways as a sum of consecutive naturals, for example, 60730 + ... + 62996.

It is an arithmetic number, because the mean of its divisors is an integer number (12390084).

Almost surely, 2^140243421 is an apocalyptic number.

It is an amenable number.

140243421 is a deficient number, since it is larger than the sum of its proper divisors (57997923).

140243421 is a wasteful number, since it uses less digits than its factorization.

140243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 140243421 is about 11842.4415134718. The cubic root of 140243421 is about 519.5501792933.

Adding to 140243421 its reverse (124342041), we get a palindrome (264585462).

The spelling of 140243421 in words is "one hundred forty million, two hundred forty-three thousand, four hundred twenty-one".