405493541 has 4 divisors (see below), whose sum is σ = 406877772. Its totient is φ = 404109312.

The previous prime is 405493511. The next prime is 405493549. The reversal of 405493541 is 145394504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 397204900 + 8288641 = 19930^2 + 2879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405493541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405493549) 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, 691676 + ... + 692261.

It is an arithmetic number, because the mean of its divisors is an integer number (101719443).

Almost surely, 2^405493541 is an apocalyptic number.

It is an amenable number.

405493541 is a deficient number, since it is larger than the sum of its proper divisors (1384231).

405493541 is a wasteful number, since it uses less digits than its factorization.

405493541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384230.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 405493541 is about 20136.8701887855. The cubic root of 405493541 is about 740.1640377763.

The spelling of 405493541 in words is "four hundred five million, four hundred ninety-three thousand, five hundred forty-one".