405051 has 4 divisors (see below), whose sum is σ = 540072. Its totient is φ = 270032.

The previous prime is 405049. The next prime is 405071. The reversal of 405051 is 150504.

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 405051 - 2¹ = 405049 is a prime.

It is an Ulam number.

It is a D-number.

405051 is a lucky number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 405051.

It is not an unprimeable number, because it can be changed into a prime (405001) 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, 67506 + ... + 67511.

It is an arithmetic number, because the mean of its divisors is an integer number (135018).

2⁴⁰⁵⁰⁵¹ is an apocalyptic number.

405051 is a deficient number, since it is larger than the sum of its proper divisors (135021).

405051 is a wasteful number, since it uses less digits than its factorization.

405051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135020.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 405051 is about 636.4361711908. The cubic root of 405051 is about 73.9894677000.

Adding to 405051 its reverse (150504), we get a palindrome (555555).

The spelling of 405051 in words is "four hundred five thousand, fifty-one".