121543406 has 8 divisors (see below), whose sum is σ = 182960184. Its totient is φ = 60556680.

The previous prime is 121543403. The next prime is 121543441. The reversal of 121543406 is 604345121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121543403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106805 + ... + 107936.

It is an arithmetic number, because the mean of its divisors is an integer number (22870023).

Almost surely, 2^121543406 is an apocalyptic number.

121543406 is a deficient number, since it is larger than the sum of its proper divisors (61416778).

121543406 is a wasteful number, since it uses less digits than its factorization.

121543406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215026.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 121543406 is about 11024.6726028486. The cubic root of 121543406 is about 495.3480611573.

Adding to 121543406 its reverse (604345121), we get a palindrome (725888527).

The spelling of 121543406 in words is "one hundred twenty-one million, five hundred forty-three thousand, four hundred six".