4000400129 has 4 divisors (see below), whose sum is σ = 4364072880. Its totient is φ = 3636727380.

The previous prime is 4000400113. The next prime is 4000400149. The reversal of 4000400129 is 9210040004.

4000400129 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 4000400129 - 2⁴ = 4000400113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4000400129.

It is not an unprimeable number, because it can be changed into a prime (4000400149) 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, 181836359 + ... + 181836380.

It is an arithmetic number, because the mean of its divisors is an integer number (1091018220).

Almost surely, 2^4000400129 is an apocalyptic number.

It is an amenable number.

4000400129 is a deficient number, since it is larger than the sum of its proper divisors (363672751).

4000400129 is a wasteful number, since it uses less digits than its factorization.

4000400129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363672750.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4000400129 is about 63248.7164217583. The cubic root of 4000400129 is about 1587.4539806363.

The spelling of 4000400129 in words is "four billion, four hundred thousand, one hundred twenty-nine".