405487400420 has 12 divisors (see below), whose sum is σ = 851523540924. Its totient is φ = 162194960160.

The previous prime is 405487400399. The next prime is 405487400429. The reversal of 405487400420 is 24004784504.

It can be written as a sum of positive squares in 2 ways, for example, as 181167707044 + 224319693376 = 425638^2 + 473624^2 .

It is not an unprimeable number, because it can be changed into a prime (405487400429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10137184991 + ... + 10137185030.

It is an arithmetic number, because the mean of its divisors is an integer number (70960295077).

Almost surely, 2^405487400420 is an apocalyptic number.

It is an amenable number.

405487400420 is an abundant number, since it is smaller than the sum of its proper divisors (446036140504).

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

405487400420 is a wasteful number, since it uses less digits than its factorization.

405487400420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20274370030 (or 20274370028 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 38.

The spelling of 405487400420 in words is "four hundred five billion, four hundred eighty-seven million, four hundred thousand, four hundred twenty".