23212404 has 18 divisors (see below), whose sum is σ = 58675890. Its totient is φ = 7737456.

The previous prime is 23212403. The next prime is 23212439. The reversal of 23212404 is 40421232.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 2528100 = 4548^2 + 1590^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23212403) 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, 322359 + ... + 322430.

Almost surely, 2^23212404 is an apocalyptic number.

It is an amenable number.

23212404 is an abundant number, since it is smaller than the sum of its proper divisors (35463486).

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

23212404 is a wasteful number, since it uses less digits than its factorization.

23212404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644799 (or 644794 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 23212404 is about 4817.9252796198. The cubic root of 23212404 is about 285.2594497954.

Adding to 23212404 its reverse (40421232), we get a palindrome (63633636).

The spelling of 23212404 in words is "twenty-three million, two hundred twelve thousand, four hundred four".