121539804 has 12 divisors (see below), whose sum is σ = 283592904. Its totient is φ = 40513264.

The previous prime is 121539799. The next prime is 121539829. The reversal of 121539804 is 408935121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5064147 + ... + 5064170.

It is an arithmetic number, because the mean of its divisors is an integer number (23632742).

Almost surely, 2^121539804 is an apocalyptic number.

It is an amenable number.

121539804 is an abundant number, since it is smaller than the sum of its proper divisors (162053100).

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

121539804 is a wasteful number, since it uses less digits than its factorization.

121539804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10128324 (or 10128322 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 121539804 is about 11024.5092407780. The cubic root of 121539804 is about 495.3431678126.

The spelling of 121539804 in words is "one hundred twenty-one million, five hundred thirty-nine thousand, eight hundred four".