140838721 has 2 divisors, whose sum is σ = 140838722. Its totient is φ = 140838720.

The previous prime is 140838707. The next prime is 140838739. The reversal of 140838721 is 127838041.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135839025 + 4999696 = 11655^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 140838721 - 2⁹ = 140838209 is a prime.

It is not a weakly prime, because it can be changed into another prime (140838701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70419360 + 70419361.

It is an arithmetic number, because the mean of its divisors is an integer number (70419361).

Almost surely, 2^140838721 is an apocalyptic number.

It is an amenable number.

140838721 is a deficient number, since it is larger than the sum of its proper divisors (1).

140838721 is an equidigital number, since it uses as much as digits as its factorization.

140838721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 140838721 is about 11867.5490729973. The cubic root of 140838721 is about 520.2842639542.

The spelling of 140838721 in words is "one hundred forty million, eight hundred thirty-eight thousand, seven hundred twenty-one".