121539407 has 8 divisors (see below), whose sum is σ = 134568192. Its totient is φ = 108840600.

The previous prime is 121539403. The next prime is 121539419. The reversal of 121539407 is 704935121.

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

It is not a de Polignac number, because 121539407 - 2² = 121539403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121539403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81719 + ... + 83192.

It is an arithmetic number, because the mean of its divisors is an integer number (16821024).

Almost surely, 2^121539407 is an apocalyptic number.

121539407 is a deficient number, since it is larger than the sum of its proper divisors (13028785).

121539407 is a wasteful number, since it uses less digits than its factorization.

121539407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164989.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 121539407 is about 11024.4912354267. The cubic root of 121539407 is about 495.3426284791.

The spelling of 121539407 in words is "one hundred twenty-one million, five hundred thirty-nine thousand, four hundred seven".