140821399 has 4 divisors (see below), whose sum is σ = 142273264. Its totient is φ = 139369536.

The previous prime is 140821393. The next prime is 140821403. The reversal of 140821399 is 993128041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993128041 = 20639 ⋅48119.

It is a cyclic number.

It is not a de Polignac number, because 140821399 - 2¹³ = 140813207 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 (140821393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725787 + ... + 725980.

It is an arithmetic number, because the mean of its divisors is an integer number (35568316).

Almost surely, 2^140821399 is an apocalyptic number.

140821399 is a deficient number, since it is larger than the sum of its proper divisors (1451865).

140821399 is an equidigital number, since it uses as much as digits as its factorization.

140821399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451864.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 140821399 is about 11866.8192452738. The cubic root of 140821399 is about 520.2629328566.

The spelling of 140821399 in words is "one hundred forty million, eight hundred twenty-one thousand, three hundred ninety-nine".