405215212025 has 12 divisors (see below), whose sum is σ = 541118160492. Its totient is φ = 299235848640.

The previous prime is 405215212021. The next prime is 405215212049. The reversal of 405215212025 is 520212512504.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 72777961 + 405142434064 = 8531^2 + 636508^2 .

It is not a de Polignac number, because 405215212025 - 2² = 405215212021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405215212021) 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 11 ways as a sum of consecutive naturals, for example, 623407694 + ... + 623408343.

It is an arithmetic number, because the mean of its divisors is an integer number (45093180041).

Almost surely, 2^405215212025 is an apocalyptic number.

It is an amenable number.

405215212025 is a deficient number, since it is larger than the sum of its proper divisors (135902948467).

405215212025 is a wasteful number, since it uses less digits than its factorization.

405215212025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246816060 (or 1246816055 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 405215212025 its reverse (520212512504), we get a palindrome (925427724529).

The spelling of 405215212025 in words is "four hundred five billion, two hundred fifteen million, two hundred twelve thousand, twenty-five".