406102909 has 4 divisors (see below), whose sum is σ = 416007900. Its totient is φ = 396197920.

The previous prime is 406102891. The next prime is 406102933. The reversal of 406102909 is 909201604.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232654009 + 173448900 = 15253^2 + 13170^2 .

It is a cyclic number.

It is not a de Polignac number, because 406102909 - 2¹⁵ = 406070141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406102999) 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, 4952434 + ... + 4952515.

It is an arithmetic number, because the mean of its divisors is an integer number (104001975).

Almost surely, 2^406102909 is an apocalyptic number.

It is an amenable number.

406102909 is a deficient number, since it is larger than the sum of its proper divisors (9904991).

406102909 is an equidigital number, since it uses as much as digits as its factorization.

406102909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904990.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 406102909 is about 20151.9951617700. The cubic root of 406102909 is about 740.5346203611.

The spelling of 406102909 in words is "four hundred six million, one hundred two thousand, nine hundred nine".