121890823 has 8 divisors (see below), whose sum is σ = 127352448. Its totient is φ = 116442744.

The previous prime is 121890817. The next prime is 121890841. The reversal of 121890823 is 328098121.

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

It is not a de Polignac number, because 121890823 - 2²¹ = 119793671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121890023) by changing a digit.

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, 17940 + ... + 23782.

It is an arithmetic number, because the mean of its divisors is an integer number (15919056).

Almost surely, 2^121890823 is an apocalyptic number.

121890823 is a deficient number, since it is larger than the sum of its proper divisors (5461625).

121890823 is an equidigital number, since it uses as much as digits as its factorization.

121890823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 121890823 is about 11040.4177004314. The cubic root of 121890823 is about 495.8195761893.

The spelling of 121890823 in words is "one hundred twenty-one million, eight hundred ninety thousand, eight hundred twenty-three".