405998503 has 4 divisors (see below), whose sum is σ = 406632528. Its totient is φ = 405364480.

The previous prime is 405998501. The next prime is 405998531. The reversal of 405998503 is 305899504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405998503 - 2¹ = 405998501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405998503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405998501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316051 + ... + 317332.

It is an arithmetic number, because the mean of its divisors is an integer number (101658132).

Almost surely, 2^405998503 is an apocalyptic number.

405998503 is a deficient number, since it is larger than the sum of its proper divisors (634025).

405998503 is an equidigital number, since it uses as much as digits as its factorization.

405998503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634024.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 405998503 is about 20149.4045321444. The cubic root of 405998503 is about 740.4711529635.

The spelling of 405998503 in words is "four hundred five million, nine hundred ninety-eight thousand, five hundred three".