121619646 has 48 divisors (see below), whose sum is σ = 278928000. Its totient is φ = 38191824.

The previous prime is 121619621. The next prime is 121619647. The reversal of 121619646 is 646916121.

121619646 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 1 + 9 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 121619646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121619647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67165 + ... + 68951.

It is an arithmetic number, because the mean of its divisors is an integer number (5811000).

Almost surely, 2^121619646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121619646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139464000).

121619646 is an abundant number, since it is smaller than the sum of its proper divisors (157308354).

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

121619646 is a wasteful number, since it uses less digits than its factorization.

121619646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013 (or 2010 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 121619646 is about 11028.1297598460. The cubic root of 121619646 is about 495.4516111122.

It can be divided in two parts, 121619 and 646, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 121619646 in words is "one hundred twenty-one million, six hundred nineteen thousand, six hundred forty-six".