23404340 has 48 divisors (see below), whose sum is σ = 51988608. Its totient is φ = 8832384.

The previous prime is 23404327. The next prime is 23404351. The reversal of 23404340 is 4340432.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37874 + ... + 38486.

It is an arithmetic number, because the mean of its divisors is an integer number (1083096).

Almost surely, 2^23404340 is an apocalyptic number.

23404340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23404340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25994304).

23404340 is an abundant number, since it is smaller than the sum of its proper divisors (28584268).

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

23404340 is a wasteful number, since it uses less digits than its factorization.

23404340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 23404340 is about 4837.8032204710. The cubic root of 23404340 is about 286.0435325849.

Adding to 23404340 its reverse (4340432), we get a palindrome (27744772).

The spelling of 23404340 in words is "twenty-three million, four hundred four thousand, three hundred forty".