405896491 has 16 divisors (see below), whose sum is σ = 544981248. Its totient is φ = 291952800.

The previous prime is 405896467. The next prime is 405896497. The reversal of 405896491 is 194698504.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 405896491 - 2¹³ = 405888299 is a prime.

It is a super-2 number, since 2×405896491² = 329503922812226162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405896497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201745 + ... + 203746.

It is an arithmetic number, because the mean of its divisors is an integer number (34061328).

Almost surely, 2^405896491 is an apocalyptic number.

405896491 is a deficient number, since it is larger than the sum of its proper divisors (139084757).

405896491 is a wasteful number, since it uses less digits than its factorization.

405896491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405522.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 405896491 is about 20146.8729831704. The cubic root of 405896491 is about 740.4091303451.

The spelling of 405896491 in words is "four hundred five million, eight hundred ninety-six thousand, four hundred ninety-one".