40021308 has 18 divisors (see below), whose sum is σ = 101165064. Its totient is φ = 13340424.

The previous prime is 40021273. The next prime is 40021313. The reversal of 40021308 is 80312004.

It is a happy number.

40021308 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555816 + ... + 555887.

Almost surely, 2^40021308 is an apocalyptic number.

It is an amenable number.

40021308 is an abundant number, since it is smaller than the sum of its proper divisors (61143756).

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

40021308 is a wasteful number, since it uses less digits than its factorization.

40021308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111713 (or 1111708 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 40021308 is about 6326.2396413667. The cubic root of 40021308 is about 342.0559055012.

The spelling of 40021308 in words is "forty million, twenty-one thousand, three hundred eight".