121440078 has 48 divisors (see below), whose sum is σ = 281277360. Its totient is φ = 37732608.

The previous prime is 121440071. The next prime is 121440079. The reversal of 121440078 is 870044121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121440071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30888 + ... + 34596.

It is an arithmetic number, because the mean of its divisors is an integer number (5859945).

Almost surely, 2^121440078 is an apocalyptic number.

121440078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121440078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140638680).

121440078 is an abundant number, since it is smaller than the sum of its proper divisors (159837282).

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

121440078 is a wasteful number, since it uses less digits than its factorization.

121440078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3841 (or 3838 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 121440078 is about 11019.9853901900. The cubic root of 121440078 is about 495.2076508649.

Adding to 121440078 its reverse (870044121), we get a palindrome (991484199).

The spelling of 121440078 in words is "one hundred twenty-one million, four hundred forty thousand, seventy-eight".