121726489 has 4 divisors (see below), whose sum is σ = 122065920. Its totient is φ = 121387060.

The previous prime is 121726487. The next prime is 121726519. The reversal of 121726489 is 984627121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121726489 - 2¹ = 121726487 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121726481) 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, 169177 + ... + 169894.

It is an arithmetic number, because the mean of its divisors is an integer number (30516480).

Almost surely, 2^121726489 is an apocalyptic number.

It is an amenable number.

121726489 is a deficient number, since it is larger than the sum of its proper divisors (339431).

121726489 is an equidigital number, since it uses as much as digits as its factorization.

121726489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339430.

The product of its digits is 48384, while the sum is 40.

The square root of 121726489 is about 11032.9728088127. The cubic root of 121726489 is about 495.5966535854.

The spelling of 121726489 in words is "one hundred twenty-one million, seven hundred twenty-six thousand, four hundred eighty-nine".