140337821 has 8 divisors (see below), whose sum is σ = 151412184. Its totient is φ = 129303360.

The previous prime is 140337797. The next prime is 140337829. The reversal of 140337821 is 128733041.

140337821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1428025 + 138909796 = 1195^2 + 11786^2 .

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 140337821 - 2¹⁴ = 140321437 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 (140337829) 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, 2450 + ... + 16931.

It is an arithmetic number, because the mean of its divisors is an integer number (18926523).

Almost surely, 2^140337821 is an apocalyptic number.

It is an amenable number.

140337821 is a deficient number, since it is larger than the sum of its proper divisors (11074363).

140337821 is a wasteful number, since it uses less digits than its factorization.

140337821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 140337821 is about 11846.4265076014. The cubic root of 140337821 is about 519.6667255485. Note that the first 3 decimals are identical.

The spelling of 140337821 in words is "one hundred forty million, three hundred thirty-seven thousand, eight hundred twenty-one".