1440925721 has 4 divisors (see below), whose sum is σ = 1442313600. Its totient is φ = 1439537844.

The previous prime is 1440925711. The next prime is 1440925741. The reversal of 1440925721 is 1275290441.

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: 1275290441 = 463 ⋅2754407.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440925721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440925711) 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, 692381 + ... + 694458.

It is an arithmetic number, because the mean of its divisors is an integer number (360578400).

Almost surely, 2^1440925721 is an apocalyptic number.

It is an amenable number.

1440925721 is a deficient number, since it is larger than the sum of its proper divisors (1387879).

1440925721 is a wasteful number, since it uses less digits than its factorization.

1440925721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387878.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1440925721 is about 37959.5274074902. The cubic root of 1440925721 is about 1129.4851652702.

The spelling of 1440925721 in words is "one billion, four hundred forty million, nine hundred twenty-five thousand, seven hundred twenty-one".