121854642 has 64 divisors (see below), whose sum is σ = 304518144. Its totient is φ = 31648320.

The previous prime is 121854613. The next prime is 121854659. The reversal of 121854642 is 246458121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34917 + ... + 38247.

It is an arithmetic number, because the mean of its divisors is an integer number (4758096).

Almost surely, 2^121854642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121854642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152259072).

121854642 is an abundant number, since it is smaller than the sum of its proper divisors (182663502).

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

121854642 is a wasteful number, since it uses less digits than its factorization.

121854642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423.

The product of its digits is 15360, while the sum is 33.

The square root of 121854642 is about 11038.7790085679. The cubic root of 121854642 is about 495.7705130936.

The spelling of 121854642 in words is "one hundred twenty-one million, eight hundred fifty-four thousand, six hundred forty-two".