23430240 has 144 divisors (see below), whose sum is σ = 81729648. Its totient is φ = 6110208.

The previous prime is 23430223. The next prime is 23430263. The reversal of 23430240 is 4203432.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×23430240² = 1097952292915200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76167 + ... + 76473.

It is an arithmetic number, because the mean of its divisors is an integer number (567567).

Almost surely, 2^23430240 is an apocalyptic number.

23430240 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 23430240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40864824).

23430240 is an abundant number, since it is smaller than the sum of its proper divisors (58299408).

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

23430240 is a wasteful number, since it uses less digits than its factorization.

23430240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 23430240 is about 4840.4793151092. The cubic root of 23430240 is about 286.1490086965.

Adding to 23430240 its reverse (4203432), we get a palindrome (27633672).

The spelling of 23430240 in words is "twenty-three million, four hundred thirty thousand, two hundred forty".