121639200 has 72 divisors (see below), whose sum is σ = 395943408. Its totient is φ = 32436480.

The previous prime is 121639183. The next prime is 121639201. The reversal of 121639200 is 2936121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (121639201) 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 11 ways as a sum of consecutive naturals, for example, 22942 + ... + 27741.

It is an arithmetic number, because the mean of its divisors is an integer number (5499214).

Almost surely, 2^121639200 is an apocalyptic number.

121639200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121639200 is an abundant number, since it is smaller than the sum of its proper divisors (274304208).

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

121639200 is a wasteful number, since it uses less digits than its factorization.

121639200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50706 (or 50693 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 121639200 is about 11029.0162752623. The cubic root of 121639200 is about 495.4781625835.

The spelling of 121639200 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, two hundred".