838400121 has 48 divisors (see below), whose sum is σ = 1362816000. Its totient is φ = 493105536.

The previous prime is 838400119. The next prime is 838400141. The reversal of 838400121 is 121004838.

It is not a de Polignac number, because 838400121 - 2¹ = 838400119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (838400141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 348280 + ... + 350678.

It is an arithmetic number, because the mean of its divisors is an integer number (28392000).

Almost surely, 2^838400121 is an apocalyptic number.

It is an amenable number.

838400121 is a deficient number, since it is larger than the sum of its proper divisors (524415879).

838400121 is a wasteful number, since it uses less digits than its factorization.

838400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 838400121 is about 28955.1398028053. The cubic root of 838400121 is about 942.9393884079.

Adding to 838400121 its reverse (121004838), we get a palindrome (959404959).

The spelling of 838400121 in words is "eight hundred thirty-eight million, four hundred thousand, one hundred twenty-one".