402240042405 has 48 divisors (see below), whose sum is σ = 739282877424. Its totient is φ = 201620428800.

The previous prime is 402240042401. The next prime is 402240042419. The reversal of 402240042405 is 504240042204.

It can be written as a sum of positive squares in 8 ways, for example, as 151004519649 + 251235522756 = 388593^2 + 501234^2 .

It is not a de Polignac number, because 402240042405 - 2² = 402240042401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402240042401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161227 + ... + 911303.

It is an arithmetic number, because the mean of its divisors is an integer number (15401726613).

Almost surely, 2^402240042405 is an apocalyptic number.

402240042405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

402240042405 is a deficient number, since it is larger than the sum of its proper divisors (337042835019).

402240042405 is a wasteful number, since it uses less digits than its factorization.

402240042405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750806 (or 750803 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 27.

Adding to 402240042405 its reverse (504240042204), we get a palindrome (906480084609).

The spelling of 402240042405 in words is "four hundred two billion, two hundred forty million, forty-two thousand, four hundred five".