2721408 has 64 divisors (see below), whose sum is σ = 7629600.
Its totient is φ = 857088.
The previous prime is 2721401. The next prime is 2721413. The reversal of 2721408 is 8041272.
It is a tau number, because it is divible by the number of its divisors (64).
It is a Harshad number since it is a multiple of its sum of digits (24).
It is not an unprimeable number, because it can be changed into a prime (2721401) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7110 + ... + 7482.
22721408 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2721408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3814800).
2721408 is an abundant number, since it is smaller than the sum of its proper divisors (4908192).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2721408 is a wasteful number, since it uses less digits than its factorization.
2721408 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 409 (or 397 counting only the distinct ones).
The product of its (nonzero) digits is 896, while the sum is 24.
The square root of 2721408 is about 1649.6690577204.
The cubic root of 2721408 is about 139.6147230116.
The spelling of 2721408 in words is "two million, seven hundred twenty-one thousand, four hundred eight".