404142643 has 4 divisors (see below), whose sum is σ = 408309160. Its totient is φ = 399976128.

The previous prime is 404142619. The next prime is 404142647. The reversal of 404142643 is 346241404.

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-404142643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404142647) 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, 2083113 + ... + 2083306.

It is an arithmetic number, because the mean of its divisors is an integer number (102077290).

Almost surely, 2^404142643 is an apocalyptic number.

404142643 is a deficient number, since it is larger than the sum of its proper divisors (4166517).

404142643 is an equidigital number, since it uses as much as digits as its factorization.

404142643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4166516.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 404142643 is about 20103.2993063328. The cubic root of 404142643 is about 739.3411734170.

The spelling of 404142643 in words is "four hundred four million, one hundred forty-two thousand, six hundred forty-three".