1670000405 has 4 divisors (see below), whose sum is σ = 2004000492. Its totient is φ = 1336000320.

The previous prime is 1670000401. The next prime is 1670000407. The reversal of 1670000405 is 5040000761.

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 865654084 + 804346321 = 29422^2 + 28361^2 .

It is not a de Polignac number, because 1670000405 - 2² = 1670000401 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 (1670000401) 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, 167000036 + ... + 167000045.

It is an arithmetic number, because the mean of its divisors is an integer number (501000123).

Almost surely, 2^1670000405 is an apocalyptic number.

It is an amenable number.

1670000405 is a deficient number, since it is larger than the sum of its proper divisors (334000087).

1670000405 is an equidigital number, since it uses as much as digits as its factorization.

1670000405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334000086.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1670000405 is about 40865.6384386687. The cubic root of 1670000405 is about 1186.4210917769.

The spelling of 1670000405 in words is "one billion, six hundred seventy million, four hundred five", and thus it is an aban number.