121439755 has 8 divisors (see below), whose sum is σ = 154300032. Its totient is φ = 91436928.

The previous prime is 121439743. The next prime is 121439761. The reversal of 121439755 is 557934121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121439755 is a prime.

It is a super-2 number, since 2×121439755² = 29495228188920050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714267 + ... + 714436.

It is an arithmetic number, because the mean of its divisors is an integer number (19287504).

Almost surely, 2^121439755 is an apocalyptic number.

121439755 is a deficient number, since it is larger than the sum of its proper divisors (32860277).

121439755 is a wasteful number, since it uses less digits than its factorization.

121439755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428725.

The product of its digits is 37800, while the sum is 37.

The square root of 121439755 is about 11019.9707349884. The cubic root of 121439755 is about 495.2072118220.

The spelling of 121439755 in words is "one hundred twenty-one million, four hundred thirty-nine thousand, seven hundred fifty-five".