23436540 has 240 divisors, whose sum is σ = 83426112. Its totient is φ = 5474304.

The previous prime is 23436521. The next prime is 23436551. The reversal of 23436540 is 4563432.

23436540 is a `hidden beast` number, since 2 + 3 + 4 + 3 + 654 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 633402 + ... + 633438.

Almost surely, 2^23436540 is an apocalyptic number.

23436540 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 23436540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41713056).

23436540 is an abundant number, since it is smaller than the sum of its proper divisors (59989572).

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

23436540 is a wasteful number, since it uses less digits than its factorization.

23436540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 23436540 is about 4841.1300333703. The cubic root of 23436540 is about 286.1746532937.

Adding to 23436540 its reverse (4563432), we get a palindrome (27999972).

The spelling of 23436540 in words is "twenty-three million, four hundred thirty-six thousand, five hundred forty".