402100809 has 8 divisors (see below), whose sum is σ = 584873952. Its totient is φ = 243697440.

The previous prime is 402100807. The next prime is 402100823. The reversal of 402100809 is 908001204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402100809 - 2¹ = 402100807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402100807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6092404 + ... + 6092469.

It is an arithmetic number, because the mean of its divisors is an integer number (73109244).

Almost surely, 2^402100809 is an apocalyptic number.

It is an amenable number.

402100809 is a deficient number, since it is larger than the sum of its proper divisors (182773143).

402100809 is a wasteful number, since it uses less digits than its factorization.

402100809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12184887.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 402100809 is about 20052.4514461449. The cubic root of 402100809 is about 738.0939558407.

The spelling of 402100809 in words is "four hundred two million, one hundred thousand, eight hundred nine".