205421408 has 12 divisors (see below), whose sum is σ = 404423460. Its totient is φ = 102710688.

The previous prime is 205421401. The next prime is 205421423. The reversal of 205421408 is 804124502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205421401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3209678 + ... + 3209741.

It is an arithmetic number, because the mean of its divisors is an integer number (33701955).

Almost surely, 2^205421408 is an apocalyptic number.

It is an amenable number.

205421408 is a deficient number, since it is larger than the sum of its proper divisors (199002052).

205421408 is an equidigital number, since it uses as much as digits as its factorization.

205421408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419429 (or 6419421 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 205421408 is about 14332.5297139061. The cubic root of 205421408 is about 590.0406062256.

The spelling of 205421408 in words is "two hundred five million, four hundred twenty-one thousand, four hundred eight".