121438840 has 64 divisors (see below), whose sum is σ = 280467360. Its totient is φ = 47308800.

The previous prime is 121438817. The next prime is 121438841. The reversal of 121438840 is 48834121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121438841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302640 + ... + 303040.

Almost surely, 2^121438840 is an apocalyptic number.

121438840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121438840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140233680).

121438840 is an abundant number, since it is smaller than the sum of its proper divisors (159028520).

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

121438840 is a wasteful number, since it uses less digits than its factorization.

121438840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 121438840 is about 11019.9292193734. The cubic root of 121438840 is about 495.2059680894.

The spelling of 121438840 in words is "one hundred twenty-one million, four hundred thirty-eight thousand, eight hundred forty".