23121778 has 8 divisors (see below), whose sum is σ = 34708572. Its totient is φ = 11552256.

The previous prime is 23121773. The next prime is 23121797. The reversal of 23121778 is 87712132.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 1471369 = 4653^2 + 1213^2 .

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

It is not an unprimeable number, because it can be changed into a prime (23121773) 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 3 ways as a sum of consecutive naturals, for example, 175 + ... + 6802.

Almost surely, 2^23121778 is an apocalyptic number.

23121778 is a deficient number, since it is larger than the sum of its proper divisors (11586794).

23121778 is a wasteful number, since it uses less digits than its factorization.

23121778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8636.

The product of its digits is 4704, while the sum is 31.

The square root of 23121778 is about 4808.5109961401. The cubic root of 23121778 is about 284.8877284261.

It can be divided in two parts, 23 and 121778, that added together give a square (121801 = 349²).

The spelling of 23121778 in words is "twenty-three million, one hundred twenty-one thousand, seven hundred seventy-eight".