121540986 has 80 divisors (see below), whose sum is σ = 327687360. Its totient is φ = 32892480.

The previous prime is 121540963. The next prime is 121541009. The reversal of 121540986 is 689045121.

121540986 is a `hidden beast` number, since 1 + 21 + 540 + 98 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (121540963) and next prime (121541009).

It is a super-2 number, since 2×121540986² = 29544422555704392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121540986.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18726 + ... + 24366.

It is an arithmetic number, because the mean of its divisors is an integer number (4096092).

Almost surely, 2^121540986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121540986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163843680).

121540986 is an abundant number, since it is smaller than the sum of its proper divisors (206146374).

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

121540986 is a wasteful number, since it uses less digits than its factorization.

121540986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5681 (or 5672 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 121540986 is about 11024.5628484761. The cubic root of 121540986 is about 495.3447735793.

The spelling of 121540986 in words is "one hundred twenty-one million, five hundred forty thousand, nine hundred eighty-six".