121539994 has 8 divisors (see below), whose sum is σ = 182792160. Its totient is φ = 60609276.

The previous prime is 121539983. The next prime is 121539997. The reversal of 121539994 is 499935121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121539994.

It is not an unprimeable number, because it can be changed into a prime (121539997) 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, 79414 + ... + 80929.

It is an arithmetic number, because the mean of its divisors is an integer number (22849020).

Almost surely, 2^121539994 is an apocalyptic number.

121539994 is a deficient number, since it is larger than the sum of its proper divisors (61252166).

121539994 is a wasteful number, since it uses less digits than its factorization.

121539994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160724.

The product of its digits is 87480, while the sum is 43.

The square root of 121539994 is about 11024.5178579383. The cubic root of 121539994 is about 495.3434259315.

It can be divided in two parts, 1215 and 39994, that added together give a square (41209 = 203²).

The spelling of 121539994 in words is "one hundred twenty-one million, five hundred thirty-nine thousand, nine hundred ninety-four".