406021028 has 12 divisors (see below), whose sum is σ = 812042112. Its totient is φ = 174009000.

The previous prime is 406021027. The next prime is 406021037. The reversal of 406021028 is 820120604.

406021028 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 406020994 and 406021012.

It is not an unprimeable number, because it can be changed into a prime (406021027) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7250348 + ... + 7250403.

It is an arithmetic number, because the mean of its divisors is an integer number (67670176).

Almost surely, 2^406021028 is an apocalyptic number.

It is an amenable number.

406021028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

406021028 is a wasteful number, since it uses less digits than its factorization.

406021028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500762 (or 14500760 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 406021028 is about 20149.9634739123. The cubic root of 406021028 is about 740.4848466136.

The spelling of 406021028 in words is "four hundred six million, twenty-one thousand, twenty-eight".