405221867 has 4 divisors (see below), whose sum is σ = 407803056. Its totient is φ = 402640680.

The previous prime is 405221857. The next prime is 405221893. The reversal of 405221867 is 768122504.

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 405221867 - 2¹⁴ = 405205483 is a prime.

It is a super-2 number, since 2×405221867² = 328409522989931378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405221807) 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, 1290359 + ... + 1290672.

It is an arithmetic number, because the mean of its divisors is an integer number (101950764).

Almost surely, 2^405221867 is an apocalyptic number.

405221867 is a deficient number, since it is larger than the sum of its proper divisors (2581189).

405221867 is a wasteful number, since it uses less digits than its factorization.

405221867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581188.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 405221867 is about 20130.1233726969. The cubic root of 405221867 is about 739.9987016047.

The spelling of 405221867 in words is "four hundred five million, two hundred twenty-one thousand, eight hundred sixty-seven".