121770378 has 20 divisors (see below), whose sum is σ = 272856210. Its totient is φ = 40590072.

The previous prime is 121770377. The next prime is 121770401. The reversal of 121770378 is 873077121.

It is a happy number.

121770378 is a `hidden beast` number, since 1 + 217 + 70 + 378 = 666.

It can be written as a sum of positive squares in only one way, i.e., 115283169 + 6487209 = 10737^2 + 2547^2 .

It is not an unprimeable number, because it can be changed into a prime (121770377) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 375673 + ... + 375996.

Almost surely, 2^121770378 is an apocalyptic number.

121770378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121770378 is an abundant number, since it is smaller than the sum of its proper divisors (151085832).

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

121770378 is an equidigital number, since it uses as much as digits as its factorization.

121770378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751683 (or 751674 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 121770378 is about 11034.9616220447. The cubic root of 121770378 is about 495.6562095841.

The spelling of 121770378 in words is "one hundred twenty-one million, seven hundred seventy thousand, three hundred seventy-eight".