121398823 has 12 divisors (see below), whose sum is σ = 152082840. Its totient is φ = 96051312.

The previous prime is 121398817. The next prime is 121398839. The reversal of 121398823 is 328893121.

It is a de Polignac number, because none of the positive numbers 2^k-121398823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121398803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94653 + ... + 95926.

It is an arithmetic number, because the mean of its divisors is an integer number (12673570).

Almost surely, 2^121398823 is an apocalyptic number.

121398823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121398823 is a deficient number, since it is larger than the sum of its proper divisors (30684017).

121398823 is a wasteful number, since it uses less digits than its factorization.

121398823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190606 (or 190599 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 121398823 is about 11018.1134047531. The cubic root of 121398823 is about 495.1515680465.

It can be divided in two parts, 121398 and 823, that added together give a palindrome (122221).

The spelling of 121398823 in words is "one hundred twenty-one million, three hundred ninety-eight thousand, eight hundred twenty-three".