121984538 has 12 divisors (see below), whose sum is σ = 198135198. Its totient is φ = 56300400.

The previous prime is 121984529. The next prime is 121984543. The reversal of 121984538 is 835489121.

It can be written as a sum of positive squares in 3 ways, for example, as 73222249 + 48762289 = 8557^2 + 6983^2 .

It is a super-2 number, since 2×121984538² = 29760455022146888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121984495 and 121984504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 180113 + ... + 180788.

Almost surely, 2^121984538 is an apocalyptic number.

121984538 is a deficient number, since it is larger than the sum of its proper divisors (76150660).

121984538 is a wasteful number, since it uses less digits than its factorization.

121984538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360929 (or 360916 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 121984538 is about 11044.6610631563. The cubic root of 121984538 is about 495.9466129020.

The spelling of 121984538 in words is "one hundred twenty-one million, nine hundred eighty-four thousand, five hundred thirty-eight".