405340581 has 4 divisors (see below), whose sum is σ = 540454112. Its totient is φ = 270227052.

The previous prime is 405340577. The next prime is 405340583. The reversal of 405340581 is 185043504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 405340581 - 2² = 405340577 is a prime.

It is a super-2 number, since 2×405340581² = 328601973210835122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405340583) 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, 67556761 + ... + 67556766.

It is an arithmetic number, because the mean of its divisors is an integer number (135113528).

Almost surely, 2^405340581 is an apocalyptic number.

It is an amenable number.

405340581 is a deficient number, since it is larger than the sum of its proper divisors (135113531).

405340581 is a wasteful number, since it uses less digits than its factorization.

405340581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135113530.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 405340581 is about 20133.0718222531. The cubic root of 405340581 is about 740.0709580118.

The spelling of 405340581 in words is "four hundred five million, three hundred forty thousand, five hundred eighty-one".