4000111781 has 16 divisors (see below), whose sum is σ = 4612075200. Its totient is φ = 3443666688.

The previous prime is 4000111763. The next prime is 4000111793. The reversal of 4000111781 is 1871110004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4000111781 - 2²² = 3995917477 is a prime.

It is a super-2 number, since 2×4000111781² = 32001788520989983922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000111081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204155 + ... + 222888.

It is an arithmetic number, because the mean of its divisors is an integer number (288254700).

Almost surely, 2^4000111781 is an apocalyptic number.

It is an amenable number.

4000111781 is a deficient number, since it is larger than the sum of its proper divisors (611963419).

4000111781 is a wasteful number, since it uses less digits than its factorization.

4000111781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427108.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 4000111781 is about 63246.4369035917. The cubic root of 4000111781 is about 1587.4158386035.

Adding to 4000111781 its reverse (1871110004), we get a palindrome (5871221785).

The spelling of 4000111781 in words is "four billion, one hundred eleven thousand, seven hundred eighty-one".