405551540 has 12 divisors (see below), whose sum is σ = 851658276. Its totient is φ = 162220608.

The previous prime is 405551539. The next prime is 405551563. The reversal of 405551540 is 45155504.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 118113424 + 287438116 = 10868^2 + 16954^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10138769 + ... + 10138808.

It is an arithmetic number, because the mean of its divisors is an integer number (70971523).

Almost surely, 2^405551540 is an apocalyptic number.

It is an amenable number.

405551540 is an abundant number, since it is smaller than the sum of its proper divisors (446106736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405551540 is a wasteful number, since it uses less digits than its factorization.

405551540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20277586 (or 20277584 counting only the distinct ones).

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

The square root of 405551540 is about 20138.3102568214. The cubic root of 405551540 is about 740.1993254140.

The spelling of 405551540 in words is "four hundred five million, five hundred fifty-one thousand, five hundred forty".