2021408 has 24 divisors (see below), whose sum is σ = 4013100. Its totient is φ = 1002240.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021408 is 8041202.

It can be written as a sum of positive squares in 2 ways, for example, as 1926544 + 94864 = 1388^2 + 308^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5618 + ... + 5966.

2^2021408 is an apocalyptic number.

It is an amenable number.

2021408 is a deficient number, since it is larger than the sum of its proper divisors (1991692).

2021408 is a wasteful number, since it uses less digits than its factorization.

2021408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2021408 is about 1421.7622867414. The cubic root of 2021408 is about 126.4400503326.

The spelling of 2021408 in words is "two million, twenty-one thousand, four hundred eight".