140577721 has 4 divisors (see below), whose sum is σ = 140601744. Its totient is φ = 140553700.

The previous prime is 140577691. The next prime is 140577737. The reversal of 140577721 is 127775041.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127775041 = 401 ⋅318641.

It is a cyclic number.

It is not a de Polignac number, because 140577721 - 2¹⁵ = 140544953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140577121) 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, 3126 + ... + 17056.

It is an arithmetic number, because the mean of its divisors is an integer number (35150436).

Almost surely, 2^140577721 is an apocalyptic number.

It is an amenable number.

140577721 is a deficient number, since it is larger than the sum of its proper divisors (24023).

140577721 is a wasteful number, since it uses less digits than its factorization.

140577721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24022.

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 140577721 is about 11856.5476003768. The cubic root of 140577721 is about 519.9626711369.

The spelling of 140577721 in words is "one hundred forty million, five hundred seventy-seven thousand, seven hundred twenty-one".