405340081 has 4 divisors (see below), whose sum is σ = 407079972. Its totient is φ = 403600192.

The previous prime is 405340057. The next prime is 405340099. The reversal of 405340081 is 180043504.

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 25090081 + 380250000 = 5009^2 + 19500^2 .

It is a cyclic number.

It is not a de Polignac number, because 405340081 - 2⁵ = 405340049 is a prime.

It is a super-2 number, since 2×405340081² = 328601162530173122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405340031) 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, 869596 + ... + 870061.

It is an arithmetic number, because the mean of its divisors is an integer number (101769993).

Almost surely, 2^405340081 is an apocalyptic number.

It is an amenable number.

405340081 is a deficient number, since it is larger than the sum of its proper divisors (1739891).

405340081 is a wasteful number, since it uses less digits than its factorization.

405340081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739890.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 405340081 is about 20133.0594048694. The cubic root of 405340081 is about 740.0706537117.

Adding to 405340081 its reverse (180043504), we get a palindrome (585383585).

The spelling of 405340081 in words is "four hundred five million, three hundred forty thousand, eighty-one".