23440155 has 16 divisors (see below), whose sum is σ = 37838880. Its totient is φ = 12389888.

The previous prime is 23440141. The next prime is 23440159. The reversal of 23440155 is 55104432.

It is a cyclic number.

It is not a de Polignac number, because 23440155 - 2¹⁶ = 23374619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23440159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5220 + ... + 8609.

It is an arithmetic number, because the mean of its divisors is an integer number (2364930).

Almost surely, 2^23440155 is an apocalyptic number.

23440155 is a deficient number, since it is larger than the sum of its proper divisors (14398725).

23440155 is a wasteful number, since it uses less digits than its factorization.

23440155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13950.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 23440155 is about 4841.5033822151. The cubic root of 23440155 is about 286.1893663328.

Adding to 23440155 its reverse (55104432), we get a palindrome (78544587).

The spelling of 23440155 in words is "twenty-three million, four hundred forty thousand, one hundred fifty-five".