400048729 has 4 divisors (see below), whose sum is σ = 417442176. Its totient is φ = 382655284.

The previous prime is 400048723. The next prime is 400048751. The reversal of 400048729 is 927840004.

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 400048729 - 2⁵ = 400048697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400048694 and 400048703.

It is not an unprimeable number, because it can be changed into a prime (400048723) 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, 8696689 + ... + 8696734.

It is an arithmetic number, because the mean of its divisors is an integer number (104360544).

Almost surely, 2^400048729 is an apocalyptic number.

It is an amenable number.

400048729 is a deficient number, since it is larger than the sum of its proper divisors (17393447).

400048729 is a wasteful number, since it uses less digits than its factorization.

400048729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17393446.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 400048729 is about 20001.2181879005. The cubic root of 400048729 is about 736.8362183750.

The spelling of 400048729 in words is "four hundred million, forty-eight thousand, seven hundred twenty-nine".