140039921 has 8 divisors (see below), whose sum is σ = 160193664. Its totient is φ = 119923200.

The previous prime is 140039909. The next prime is 140039929. The reversal of 140039921 is 129930041.

It is a happy number.

140039921 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 a cyclic number.

It is not a de Polignac number, because 140039921 - 2¹⁸ = 139777777 is a prime.

It is a super-2 number, since 2×140039921² = 39222358947372482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140039929) 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, 605 + ... + 16746.

It is an arithmetic number, because the mean of its divisors is an integer number (20024208).

Almost surely, 2^140039921 is an apocalyptic number.

It is an amenable number.

140039921 is a deficient number, since it is larger than the sum of its proper divisors (20153743).

140039921 is a wasteful number, since it uses less digits than its factorization.

140039921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18511.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 140039921 is about 11833.8464161066. The cubic root of 140039921 is about 519.2987601511.

Adding to 140039921 its reverse (129930041), we get a palindrome (269969962).

The spelling of 140039921 in words is "one hundred forty million, thirty-nine thousand, nine hundred twenty-one".