121777938 has 16 divisors (see below), whose sum is σ = 270617760. Its totient is φ = 40592628.

The previous prime is 121777937. The next prime is 121777969. The reversal of 121777938 is 839777121.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121777893 and 121777902.

It is not an unprimeable number, because it can be changed into a prime (121777933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127520 + ... + 1127627.

It is an arithmetic number, because the mean of its divisors is an integer number (16913610).

Almost surely, 2^121777938 is an apocalyptic number.

121777938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121777938 is an abundant number, since it is smaller than the sum of its proper divisors (148839822).

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

121777938 is a wasteful number, since it uses less digits than its factorization.

121777938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255158 (or 2255152 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 121777938 is about 11035.3041643627. The cubic root of 121777938 is about 495.6664668226. Note that the first 3 decimals are identical.

The spelling of 121777938 in words is "one hundred twenty-one million, seven hundred seventy-seven thousand, nine hundred thirty-eight".