405547 has 4 divisors (see below), whose sum is σ = 407176. Its totient is φ = 403920.

The previous prime is 405541. The next prime is 405553. The reversal of 405547 is 745504.

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

It is an interprime number because it is at equal distance from previous prime (405541) and next prime (405553).

It is a cyclic number.

It is not a de Polignac number, because 405547 - 2¹¹ = 403499 is a prime.

It is a Duffinian number.

405547 is a lucky number.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405547.

It is not an unprimeable number, because it can be changed into a prime (405541) 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, 354 + ... + 967.

It is an arithmetic number, because the mean of its divisors is an integer number (101794).

2⁴⁰⁵⁵⁴⁷ is an apocalyptic number.

405547 is a deficient number, since it is larger than the sum of its proper divisors (1629).

405547 is a wasteful number, since it uses less digits than its factorization.

405547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 405547 is about 636.8257218423. The cubic root of 405547 is about 74.0196563317.

The spelling of 405547 in words is "four hundred five thousand, five hundred forty-seven".