2421865840 has 40 divisors (see below), whose sum is σ = 5637072240. Its totient is φ = 967673856.

The previous prime is 2421865819. The next prime is 2421865841. The reversal of 2421865840 is 485681242.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2421865793 and 2421865802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421865841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58027 + ... + 90613.

It is an arithmetic number, because the mean of its divisors is an integer number (140926806).

Almost surely, 2^2421865840 is an apocalyptic number.

2421865840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2421865840 is an abundant number, since it is smaller than the sum of its proper divisors (3215206400).

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

2421865840 is a wasteful number, since it uses less digits than its factorization.

2421865840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33529 (or 33523 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The square root of 2421865840 is about 49212.4561467928. The cubic root of 2421865840 is about 1342.9196456713.

The spelling of 2421865840 in words is "two billion, four hundred twenty-one million, eight hundred sixty-five thousand, eight hundred forty".