406157728 has 12 divisors (see below), whose sum is σ = 799623090. Its totient is φ = 203078848.

The previous prime is 406157677. The next prime is 406157729. The reversal of 406157728 is 827751604.

It can be written as a sum of positive squares in only one way, i.e., 262828944 + 143328784 = 16212^2 + 11972^2 .

It is not an unprimeable number, because it can be changed into a prime (406157729) 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 as a sum of consecutive naturals, namely, 6346183 + ... + 6346246.

Almost surely, 2^406157728 is an apocalyptic number.

It is an amenable number.

406157728 is a deficient number, since it is larger than the sum of its proper divisors (393465362).

406157728 is a wasteful number, since it uses less digits than its factorization.

406157728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12692439 (or 12692431 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 406157728 is about 20153.3552541506. The cubic root of 406157728 is about 740.5679399458.

The spelling of 406157728 in words is "four hundred six million, one hundred fifty-seven thousand, seven hundred twenty-eight".