403493538 has 128 divisors (see below), whose sum is σ = 1050624000. Its totient is φ = 102622464.

The previous prime is 403493537. The next prime is 403493549. The reversal of 403493538 is 835394304.

It is a junction number, because it is equal to n+sod(n) for n = 403493496 and 403493505.

It is not an unprimeable number, because it can be changed into a prime (403493537) 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 63 ways as a sum of consecutive naturals, for example, 664431 + ... + 665037.

It is an arithmetic number, because the mean of its divisors is an integer number (8208000).

Almost surely, 2^403493538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 403493538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (525312000).

403493538 is an abundant number, since it is smaller than the sum of its proper divisors (647130462).

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

403493538 is a wasteful number, since it uses less digits than its factorization.

403493538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 403493538 is about 20087.1485781332. The cubic root of 403493538 is about 738.9451356792.

The spelling of 403493538 in words is "four hundred three million, four hundred ninety-three thousand, five hundred thirty-eight".