4002408 has 24 divisors (see below), whose sum is σ = 10840050. Its totient is φ = 1334112.

The previous prime is 4002403. The next prime is 4002431. The reversal of 4002408 is 8042004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3992004 + 10404 = 1998^2 + 102^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (4002403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27723 + ... + 27866.

Almost surely, 2^4002408 is an apocalyptic number.

It is an amenable number.

4002408 is an abundant number, since it is smaller than the sum of its proper divisors (6837642).

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

4002408 is a wasteful number, since it uses less digits than its factorization.

4002408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55601 (or 55594 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 4002408 is about 2000.6019094263. The cubic root of 4002408 is about 158.7719526547.

The spelling of 4002408 in words is "four million, two thousand, four hundred eight".