1984405 has 4 divisors (see below), whose sum is σ = 2381292. Its totient is φ = 1587520.

The previous prime is 1984399. The next prime is 1984429. The reversal of 1984405 is 5044891.

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 599076 + 1385329 = 774^2 + 1177^2 .

It is not a de Polignac number, because 1984405 - 2³ = 1984397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198436 + ... + 198445.

It is an arithmetic number, because the mean of its divisors is an integer number (595323).

2^1984405 is an apocalyptic number.

It is an amenable number.

1984405 is a deficient number, since it is larger than the sum of its proper divisors (396887).

1984405 is an equidigital number, since it uses as much as digits as its factorization.

1984405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396886.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1984405 is about 1408.6891069359. The cubic root of 1984405 is about 125.6637756427.

The spelling of 1984405 in words is "one million, nine hundred eighty-four thousand, four hundred five".