402101409 has 4 divisors (see below), whose sum is σ = 536135216. Its totient is φ = 268067604.

The previous prime is 402101363. The next prime is 402101419. The reversal of 402101409 is 904101204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 402101409 - 2⁷ = 402101281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402101419) 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 3 ways as a sum of consecutive naturals, for example, 67016899 + ... + 67016904.

It is an arithmetic number, because the mean of its divisors is an integer number (134033804).

Almost surely, 2^402101409 is an apocalyptic number.

It is an amenable number.

402101409 is a deficient number, since it is larger than the sum of its proper divisors (134033807).

402101409 is a wasteful number, since it uses less digits than its factorization.

402101409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134033806.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 402101409 is about 20052.4664069037. The cubic root of 402101409 is about 738.0943229593.

The spelling of 402101409 in words is "four hundred two million, one hundred one thousand, four hundred nine".