121539404 has 18 divisors (see below), whose sum is σ = 247419900. Its totient is φ = 52088232.

The previous prime is 121539403. The next prime is 121539419. The reversal of 121539404 is 404935121.

It is not an unprimeable number, because it can be changed into a prime (121539403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 309854 + ... + 310245.

It is an arithmetic number, because the mean of its divisors is an integer number (13745550).

Almost surely, 2^121539404 is an apocalyptic number.

121539404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121539404 is an abundant number, since it is smaller than the sum of its proper divisors (125880496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121539404 is a wasteful number, since it uses less digits than its factorization.

121539404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620117 (or 620108 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 121539404 is about 11024.4910993660. The cubic root of 121539404 is about 495.3426244035.

The spelling of 121539404 in words is "one hundred twenty-one million, five hundred thirty-nine thousand, four hundred four".