121938436 has 6 divisors (see below), whose sum is σ = 213392270. Its totient is φ = 60969216.

The previous prime is 121938403. The next prime is 121938437. The reversal of 121938436 is 634839121.

It can be written as a sum of positive squares in only one way, i.e., 91202500 + 30735936 = 9550^2 + 5544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121938395 and 121938404.

It is not an unprimeable number, because it can be changed into a prime (121938437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15242301 + ... + 15242308.

Almost surely, 2^121938436 is an apocalyptic number.

It is an amenable number.

121938436 is a deficient number, since it is larger than the sum of its proper divisors (91453834).

121938436 is a wasteful number, since it uses less digits than its factorization.

121938436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30484613 (or 30484611 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 121938436 is about 11042.5737941840. The cubic root of 121938436 is about 495.8841268085.

The spelling of 121938436 in words is "one hundred twenty-one million, nine hundred thirty-eight thousand, four hundred thirty-six".