404387983 has 4 divisors (see below), whose sum is σ = 404478328. Its totient is φ = 404297640.

The previous prime is 404387957. The next prime is 404388031. The reversal of 404387983 is 389783404.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404387983 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 (404387903) 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, 38088 + ... + 47533.

It is an arithmetic number, because the mean of its divisors is an integer number (101119582).

Almost surely, 2^404387983 is an apocalyptic number.

404387983 is a deficient number, since it is larger than the sum of its proper divisors (90345).

404387983 is an equidigital number, since it uses as much as digits as its factorization.

404387983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90344.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 404387983 is about 20109.4003640089. The cubic root of 404387983 is about 739.4907520159.

The spelling of 404387983 in words is "four hundred four million, three hundred eighty-seven thousand, nine hundred eighty-three".