4000721465 has 16 divisors (see below), whose sum is σ = 5193366528. Its totient is φ = 2941119936.

The previous prime is 4000721437. The next prime is 4000721467. The reversal of 4000721465 is 5641270004.

It is a cyclic number.

It is not a de Polignac number, because 4000721465 - 2⁸ = 4000721209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4000721467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123509 + ... + 152498.

It is an arithmetic number, because the mean of its divisors is an integer number (324585408).

Almost surely, 2^4000721465 is an apocalyptic number.

It is an amenable number.

4000721465 is a deficient number, since it is larger than the sum of its proper divisors (1192645063).

4000721465 is a wasteful number, since it uses less digits than its factorization.

4000721465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276248.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 4000721465 is about 63251.2566278331. The cubic root of 4000721465 is about 1587.4964840892.

Adding to 4000721465 its reverse (5641270004), we get a palindrome (9641991469).

The spelling of 4000721465 in words is "four billion, seven hundred twenty-one thousand, four hundred sixty-five".