406390538 has 8 divisors (see below), whose sum is σ = 621087588. Its totient is φ = 199361344.

The previous prime is 406390531. The next prime is 406390541. The reversal of 406390538 is 835093604.

It can be written as a sum of positive squares in 2 ways, for example, as 404532769 + 1857769 = 20113^2 + 1363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (406390531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1916831 + ... + 1917042.

Almost surely, 2^406390538 is an apocalyptic number.

406390538 is a deficient number, since it is larger than the sum of its proper divisors (214697050).

406390538 is a wasteful number, since it uses less digits than its factorization.

406390538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833928.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 406390538 is about 20159.1303879905. The cubic root of 406390538 is about 740.7094110038.

The spelling of 406390538 in words is "four hundred six million, three hundred ninety thousand, five hundred thirty-eight".