23111440 has 40 divisors (see below), whose sum is σ = 58621248. Its totient is φ = 8403840.

The previous prime is 23111437. The next prime is 23111441. The reversal of 23111440 is 4411132.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (23111441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12252 + ... + 14011.

Almost surely, 2^23111440 is an apocalyptic number.

23111440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23111440 is an abundant number, since it is smaller than the sum of its proper divisors (35509808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23111440 is a wasteful number, since it uses less digits than its factorization.

23111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26287 (or 26281 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 23111440 is about 4807.4359070091. The cubic root of 23111440 is about 284.8452632894.

Adding to 23111440 its reverse (4411132), we get a palindrome (27522572).

The spelling of 23111440 in words is "twenty-three million, one hundred eleven thousand, four hundred forty".