121277790 has 64 divisors (see below), whose sum is σ = 325581120. Its totient is φ = 32123520.

The previous prime is 121277771. The next prime is 121277791. The reversal of 121277790 is 97772121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121277791) 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, 40960 + ... + 43820.

It is an arithmetic number, because the mean of its divisors is an integer number (5087205).

Almost surely, 2^121277790 is an apocalyptic number.

121277790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121277790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162790560).

121277790 is an abundant number, since it is smaller than the sum of its proper divisors (204303330).

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

121277790 is a wasteful number, since it uses less digits than its factorization.

121277790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034 (or 3028 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 121277790 is about 11012.6195793735. The cubic root of 121277790 is about 494.9869601707.

The spelling of 121277790 in words is "one hundred twenty-one million, two hundred seventy-seven thousand, seven hundred ninety".