1004240861 has 4 divisors (see below), whose sum is σ = 1081490172. Its totient is φ = 926991552.

The previous prime is 1004240851. The next prime is 1004240863. The reversal of 1004240861 is 1680424001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1680424001 = 4001 ⋅420001.

It can be written as a sum of positive squares in 2 ways, for example, as 61136761 + 943104100 = 7819^2 + 30710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004240861 - 2¹⁴ = 1004224477 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 1004240861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004240863) 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, 38624636 + ... + 38624661.

It is an arithmetic number, because the mean of its divisors is an integer number (270372543).

Almost surely, 2^1004240861 is an apocalyptic number.

It is an amenable number.

1004240861 is a deficient number, since it is larger than the sum of its proper divisors (77249311).

1004240861 is an equidigital number, since it uses as much as digits as its factorization.

1004240861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77249310.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1004240861 is about 31689.7595604637. The cubic root of 1004240861 is about 1001.4116267057.

Adding to 1004240861 its reverse (1680424001), we get a palindrome (2684664862).

The spelling of 1004240861 in words is "one billion, four million, two hundred forty thousand, eight hundred sixty-one".