1000401643 has 8 divisors (see below), whose sum is σ = 1016783712. Its totient is φ = 984143616.

The previous prime is 1000401641. The next prime is 1000401679. The reversal of 1000401643 is 3461040001.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000401643 - 2¹ = 1000401641 is a prime.

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 1000401643.

It is not an unprimeable number, because it can be changed into a prime (1000401641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14680 + ... + 47077.

It is an arithmetic number, because the mean of its divisors is an integer number (127097964).

Almost surely, 2^1000401643 is an apocalyptic number.

1000401643 is a deficient number, since it is larger than the sum of its proper divisors (16382069).

1000401643 is an equidigital number, since it uses as much as digits as its factorization.

1000401643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62021.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1000401643 is about 31629.1264975813. The cubic root of 1000401643 is about 1000.1338630799.

Adding to 1000401643 its reverse (3461040001), we get a palindrome (4461441644).

The spelling of 1000401643 in words is "one billion, four hundred one thousand, six hundred forty-three".