40002128 has 20 divisors (see below), whose sum is σ = 78218580. Its totient is φ = 19816704.

The previous prime is 40002103. The next prime is 40002133. The reversal of 40002128 is 82120004.

It can be written as a sum of positive squares in 2 ways, for example, as 18731584 + 21270544 = 4328^2 + 4612^2 .

It is a congruent number.

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, 9725 + ... + 13212.

It is an arithmetic number, because the mean of its divisors is an integer number (3910929).

Almost surely, 2^40002128 is an apocalyptic number.

It is an amenable number.

40002128 is a deficient number, since it is larger than the sum of its proper divisors (38216452).

40002128 is a wasteful number, since it uses less digits than its factorization.

40002128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23054 (or 23048 counting only the distinct ones).

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

The square root of 40002128 is about 6324.7235512708. The cubic root of 40002128 is about 342.0012539425.

The spelling of 40002128 in words is "forty million, two thousand, one hundred twenty-eight".