121639044 has 12 divisors (see below), whose sum is σ = 283824464. Its totient is φ = 40546344.

The previous prime is 121639043. The next prime is 121639057. The reversal of 121639044 is 440936121.

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

It is not an unprimeable number, because it can be changed into a prime (121639043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5068282 + ... + 5068305.

Almost surely, 2^121639044 is an apocalyptic number.

It is an amenable number.

121639044 is an abundant number, since it is smaller than the sum of its proper divisors (162185420).

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

121639044 is a wasteful number, since it uses less digits than its factorization.

121639044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10136594 (or 10136592 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 121639044 is about 11029.0092030064. The cubic root of 121639044 is about 495.4779507696.

The spelling of 121639044 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, forty-four".