2399221440 has 672 divisors, whose sum is σ = 10650931200. Its totient is φ = 481075200.

The previous prime is 2399221423. The next prime is 2399221453. The reversal of 2399221440 is 441229932.

2399221440 is a `hidden beast` number, since 2 + 399 + 221 + 4 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

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 = 2399221395 and 2399221404.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6874386 + ... + 6874734.

It is an arithmetic number, because the mean of its divisors is an integer number (15849600).

Almost surely, 2^2399221440 is an apocalyptic number.

2399221440 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 2399221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5325465600).

2399221440 is an abundant number, since it is smaller than the sum of its proper divisors (8251709760).

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

2399221440 is a wasteful number, since it uses less digits than its factorization.

2399221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 2399221440 is about 48981.8480664011. The cubic root of 2399221440 is about 1338.7211084737.

The spelling of 2399221440 in words is "two billion, three hundred ninety-nine million, two hundred twenty-one thousand, four hundred forty".