1405983 has 4 divisors (see below), whose sum is σ = 1874648. Its totient is φ = 937320.

The previous prime is 1405979. The next prime is 1405997. The reversal of 1405983 is 3895041.

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

It is not a de Polignac number, because 1405983 - 2² = 1405979 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1405983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405583) 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, 234328 + ... + 234333.

It is an arithmetic number, because the mean of its divisors is an integer number (468662).

2^1405983 is an apocalyptic number.

1405983 is a deficient number, since it is larger than the sum of its proper divisors (468665).

1405983 is an equidigital number, since it uses as much as digits as its factorization.

1405983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468664.

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

The square root of 1405983 is about 1185.7415401343. The cubic root of 1405983 is about 112.0280276370.

The spelling of 1405983 in words is "one million, four hundred five thousand, nine hundred eighty-three".