4400406781 has 8 divisors (see below), whose sum is σ = 4520196824. Its totient is φ = 4280662080.

The previous prime is 4400406757. The next prime is 4400406839. The reversal of 4400406781 is 1876040044.

It can be written as a sum of positive squares in 4 ways, for example, as 89302500 + 4311104281 = 9450^2 + 65659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4400406781 - 2²³ = 4392018173 is a prime.

It is a super-2 number, since 2×4400406781² = 38727159676541563922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4400406281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299671 + ... + 314011.

It is an arithmetic number, because the mean of its divisors is an integer number (565024603).

Almost surely, 2^4400406781 is an apocalyptic number.

It is an amenable number.

4400406781 is a deficient number, since it is larger than the sum of its proper divisors (119790043).

4400406781 is a wasteful number, since it uses less digits than its factorization.

4400406781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22671.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 4400406781 is about 66335.5619633994. The cubic root of 4400406781 is about 1638.6930372703.

The spelling of 4400406781 in words is "four billion, four hundred million, four hundred six thousand, seven hundred eighty-one".