23487840 has 96 divisors (see below), whose sum is σ = 82222560. Its totient is φ = 6262272.

The previous prime is 23487809. The next prime is 23487869. The reversal of 23487840 is 4878432.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 23487795 and 23487804.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1602 + ... + 7038.

It is an arithmetic number, because the mean of its divisors is an integer number (856485).

Almost surely, 2^23487840 is an apocalyptic number.

23487840 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 23487840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41111280).

23487840 is an abundant number, since it is smaller than the sum of its proper divisors (58734720).

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

23487840 is a wasteful number, since it uses less digits than its factorization.

23487840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5461 (or 5447 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 23487840 is about 4846.4254868924. The cubic root of 23487840 is about 286.3833027104.

The spelling of 23487840 in words is "twenty-three million, four hundred eighty-seven thousand, eight hundred forty".