4000402123 has 4 divisors (see below), whose sum is σ = 4041643480. Its totient is φ = 3959160768.

The previous prime is 4000402111. The next prime is 4000402127. The reversal of 4000402123 is 3212040004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000402123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000402097 and 4000402106.

It is not an unprimeable number, because it can be changed into a prime (4000402127) 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, 20620533 + ... + 20620726.

It is an arithmetic number, because the mean of its divisors is an integer number (1010410870).

Almost surely, 2^4000402123 is an apocalyptic number.

4000402123 is a deficient number, since it is larger than the sum of its proper divisors (41241357).

4000402123 is an equidigital number, since it uses as much as digits as its factorization.

4000402123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41241356.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 4000402123 is about 63248.7321849221. The cubic root of 4000402123 is about 1587.4542443918.

Adding to 4000402123 its reverse (3212040004), we get a palindrome (7212442127).

The spelling of 4000402123 in words is "four billion, four hundred two thousand, one hundred twenty-three".