405401555 has 16 divisors (see below), whose sum is σ = 535054464. Its totient is φ = 293001600.

The previous prime is 405401467. The next prime is 405401569. The reversal of 405401555 is 555104504.

It is a happy number.

It is not a de Polignac number, because 405401555 - 2¹⁰ = 405400531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63296 + ... + 69405.

It is an arithmetic number, because the mean of its divisors is an integer number (33440904).

Almost surely, 2^405401555 is an apocalyptic number.

405401555 is a deficient number, since it is larger than the sum of its proper divisors (129652909).

405401555 is a wasteful number, since it uses less digits than its factorization.

405401555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132766.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 405401555 is about 20134.5860399463. The cubic root of 405401555 is about 740.1080649340.

The spelling of 405401555 in words is "four hundred five million, four hundred one thousand, five hundred fifty-five".