1996405 has 4 divisors (see below), whose sum is σ = 2395692. Its totient is φ = 1597120.

The previous prime is 1996403. The next prime is 1996411. The reversal of 1996405 is 5046991.

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 463761 + 1532644 = 681^2 + 1238^2 .

It is not a de Polignac number, because 1996405 - 2¹ = 1996403 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 (1996403) 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, 199636 + ... + 199645.

It is an arithmetic number, because the mean of its divisors is an integer number (598923).

2^1996405 is an apocalyptic number.

It is an amenable number.

1996405 is a deficient number, since it is larger than the sum of its proper divisors (399287).

1996405 is an equidigital number, since it uses as much as digits as its factorization.

1996405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399286.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1996405 is about 1412.9419662534. The cubic root of 1996405 is about 125.9165694434.

It can be divided in two parts, 1996 and 405, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1996405 in words is "one million, nine hundred ninety-six thousand, four hundred five".