1013643 has 18 divisors (see below), whose sum is σ = 1523132. Its totient is φ = 649440.

The previous prime is 1013641. The next prime is 1013671. The reversal of 1013643 is 3463101.

1013643 is a `hidden beast` number, since 10 + 13 + 643 = 666.

It is not a de Polignac number, because 1013643 - 2¹ = 1013641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15096 + ... + 15162.

2^1013643 is an apocalyptic number.

1013643 is a deficient number, since it is larger than the sum of its proper divisors (509489).

1013643 is an equidigital number, since it uses as much as digits as its factorization.

1013643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1013643 is about 1006.7983909403. The cubic root of 1013643 is about 100.4527140736.

Adding to 1013643 its reverse (3463101), we get a palindrome (4476744).

The spelling of 1013643 in words is "one million, thirteen thousand, six hundred forty-three".