23778369 has 6 divisors (see below), whose sum is σ = 34346546. Its totient is φ = 15852240.

The previous prime is 23778341. The next prime is 23778373. The reversal of 23778369 is 96387732.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23648769 + 129600 = 4863^2 + 360^2 .

It is not a de Polignac number, because 23778369 - 2¹³ = 23770177 is a prime.

It is a super-3 number, since 3×23778369³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23778379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1321012 + ... + 1321029.

Almost surely, 2^23778369 is an apocalyptic number.

It is an amenable number.

23778369 is a deficient number, since it is larger than the sum of its proper divisors (10568177).

23778369 is a wasteful number, since it uses less digits than its factorization.

23778369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642047 (or 2642044 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 23778369 is about 4876.3069017444. The cubic root of 23778369 is about 287.5592578546.

It can be divided in two parts, 237 and 78369, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 23778369 in words is "twenty-three million, seven hundred seventy-eight thousand, three hundred sixty-nine".