23212240 has 40 divisors (see below), whose sum is σ = 54226440. Its totient is φ = 9240576.

The previous prime is 23212207. The next prime is 23212247. The reversal of 23212240 is 4221232.

It can be written as a sum of positive squares in 4 ways, for example, as 3640464 + 19571776 = 1908^2 + 4424^2 .

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23212247) 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, 19996 + ... + 21124.

It is an arithmetic number, because the mean of its divisors is an integer number (1355661).

Almost surely, 2^23212240 is an apocalyptic number.

23212240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23212240 is an abundant number, since it is smaller than the sum of its proper divisors (31014200).

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

23212240 is a wasteful number, since it uses less digits than its factorization.

23212240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1393 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 23212240 is about 4817.9082598157. The cubic root of 23212240 is about 285.2587779899.

Adding to 23212240 its reverse (4221232), we get a palindrome (27433472).

The spelling of 23212240 in words is "twenty-three million, two hundred twelve thousand, two hundred forty".