402104242009 has 4 divisors (see below), whose sum is σ = 402105585204. Its totient is φ = 402102898816.

The previous prime is 402104241989. The next prime is 402104242063. The reversal of 402104242009 is 900242401204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 383443315984 + 18660926025 = 619228^2 + 136605^2 .

It is a cyclic number.

It is not a de Polignac number, because 402104242009 - 2⁵ = 402104241977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402104242069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3969 + ... + 896785.

It is an arithmetic number, because the mean of its divisors is an integer number (100526396301).

Almost surely, 2^402104242009 is an apocalyptic number.

It is an amenable number.

402104242009 is a deficient number, since it is larger than the sum of its proper divisors (1343195).

402104242009 is an equidigital number, since it uses as much as digits as its factorization.

402104242009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343194.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 402104242009 in words is "four hundred two billion, one hundred four million, two hundred forty-two thousand, nine".