121619780 has 24 divisors (see below), whose sum is σ = 255635352. Its totient is φ = 48603392.

The previous prime is 121619749. The next prime is 121619783. The reversal of 121619780 is 87916121.

It can be written as a sum of positive squares in 4 ways, for example, as 11075584 + 110544196 = 3328^2 + 10514^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121619780.

It is not an unprimeable number, because it can be changed into a prime (121619783) 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, 27824 + ... + 31896.

It is an arithmetic number, because the mean of its divisors is an integer number (10651473).

Almost surely, 2^121619780 is an apocalyptic number.

121619780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121619780 is an abundant number, since it is smaller than the sum of its proper divisors (134015572).

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

121619780 is a wasteful number, since it uses less digits than its factorization.

121619780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575 (or 5573 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 121619780 is about 11028.1358352171. The cubic root of 121619780 is about 495.4517930743.

The spelling of 121619780 in words is "one hundred twenty-one million, six hundred nineteen thousand, seven hundred eighty".