1983405 has 16 divisors (see below), whose sum is σ = 3312000. Its totient is φ = 1011648.

The previous prime is 1983389. The next prime is 1983409. The reversal of 1983405 is 5043891.

It is not a de Polignac number, because 1983405 - 2⁴ = 1983389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2530 + ... + 3219.

It is an arithmetic number, because the mean of its divisors is an integer number (207000).

2^1983405 is an apocalyptic number.

1983405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1983405 is a deficient number, since it is larger than the sum of its proper divisors (1328595).

1983405 is a wasteful number, since it uses less digits than its factorization.

1983405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1983405 is about 1408.3341222877. The cubic root of 1983405 is about 125.6426635394.

The spelling of 1983405 in words is "one million, nine hundred eighty-three thousand, four hundred five".