400134121 has 8 divisors (see below), whose sum is σ = 405064800. Its totient is φ = 395213280.

The previous prime is 400134079. The next prime is 400134149. The reversal of 400134121 is 121431004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400134121 - 2²³ = 391745513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400134095 and 400134104.

It is not an unprimeable number, because it can be changed into a prime (400134191) 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 7 ways as a sum of consecutive naturals, for example, 110266 + ... + 113836.

It is an arithmetic number, because the mean of its divisors is an integer number (50633100).

Almost surely, 2^400134121 is an apocalyptic number.

It is an amenable number.

400134121 is a deficient number, since it is larger than the sum of its proper divisors (4930679).

400134121 is a wasteful number, since it uses less digits than its factorization.

400134121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 400134121 is about 20003.3527439777. The cubic root of 400134121 is about 736.8886415237. Note that the first 3 decimals are identical.

Adding to 400134121 its reverse (121431004), we get a palindrome (521565125).

The spelling of 400134121 in words is "four hundred million, one hundred thirty-four thousand, one hundred twenty-one".