121838404 has 6 divisors (see below), whose sum is σ = 213217214. Its totient is φ = 60919200.

The previous prime is 121838399. The next prime is 121838407. The reversal of 121838404 is 404838121.

It can be written as a sum of positive squares in only one way, i.e., 101606400 + 20232004 = 10080^2 + 4498^2 .

It is not an unprimeable number, because it can be changed into a prime (121838407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15229797 + ... + 15229804.

Almost surely, 2^121838404 is an apocalyptic number.

It is an amenable number.

121838404 is a deficient number, since it is larger than the sum of its proper divisors (91378810).

121838404 is a wasteful number, since it uses less digits than its factorization.

121838404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30459605 (or 30459603 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 121838404 is about 11038.0434860531. The cubic root of 121838404 is about 495.7484904633.

The spelling of 121838404 in words is "one hundred twenty-one million, eight hundred thirty-eight thousand, four hundred four".