140737721 has 4 divisors (see below), whose sum is σ = 142838352. Its totient is φ = 138637092.

The previous prime is 140737673. The next prime is 140737739. The reversal of 140737721 is 127737041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127737041 = 67 ⋅1906523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140737721 is a prime.

It is a super-2 number, since 2×140737721² = 39614212224547682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140737741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050215 + ... + 1050348.

It is an arithmetic number, because the mean of its divisors is an integer number (35709588).

Almost surely, 2^140737721 is an apocalyptic number.

It is an amenable number.

140737721 is a deficient number, since it is larger than the sum of its proper divisors (2100631).

140737721 is an equidigital number, since it uses as much as digits as its factorization.

140737721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100630.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 140737721 is about 11863.2930082671. The cubic root of 140737721 is about 520.1598633236.

The spelling of 140737721 in words is "one hundred forty million, seven hundred thirty-seven thousand, seven hundred twenty-one".