4405899781 has 4 divisors (see below), whose sum is σ = 4409124192. Its totient is φ = 4402675372.

The previous prime is 4405899767. The next prime is 4405899821. The reversal of 4405899781 is 1879985044.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 4405899781 - 2¹⁵ = 4405867013 is a prime.

It is a super-2 number, since 2×4405899781² = 38823905760431695922, 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 (4405899761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610155 + ... + 1612888.

It is an arithmetic number, because the mean of its divisors is an integer number (1102281048).

Almost surely, 2^4405899781 is an apocalyptic number.

It is an amenable number.

4405899781 is a deficient number, since it is larger than the sum of its proper divisors (3224411).

4405899781 is a wasteful number, since it uses less digits than its factorization.

4405899781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3224410.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The square root of 4405899781 is about 66376.9521822146. The cubic root of 4405899781 is about 1639.3746104716.

The spelling of 4405899781 in words is "four billion, four hundred five million, eight hundred ninety-nine thousand, seven hundred eighty-one".