406491438 has 16 divisors (see below), whose sum is σ = 830280960. Its totient is φ = 132614136.

The previous prime is 406491413. The next prime is 406491451. The reversal of 406491438 is 834194604.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 406491396 and 406491405.

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 7 ways as a sum of consecutive naturals, for example, 720448 + ... + 721011.

It is an arithmetic number, because the mean of its divisors is an integer number (51892560).

Almost surely, 2^406491438 is an apocalyptic number.

406491438 is an abundant number, since it is smaller than the sum of its proper divisors (423789522).

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

406491438 is a wasteful number, since it uses less digits than its factorization.

406491438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441511.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 406491438 is about 20161.6328207812. The cubic root of 406491438 is about 740.7707078665.

The spelling of 406491438 in words is "four hundred six million, four hundred ninety-one thousand, four hundred thirty-eight".