121378878 has 64 divisors (see below), whose sum is σ = 300672000. Its totient is φ = 36070272.

The previous prime is 121378877. The next prime is 121378903. The reversal of 121378878 is 878873121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121378877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13963 + ... + 20921.

It is an arithmetic number, because the mean of its divisors is an integer number (4698000).

Almost surely, 2^121378878 is an apocalyptic number.

121378878 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 121378878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150336000).

121378878 is an abundant number, since it is smaller than the sum of its proper divisors (179293122).

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

121378878 is a wasteful number, since it uses less digits than its factorization.

121378878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006 (or 7000 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 121378878 is about 11017.2082670702. The cubic root of 121378878 is about 495.1244498843.

The spelling of 121378878 in words is "one hundred twenty-one million, three hundred seventy-eight thousand, eight hundred seventy-eight".