1042200809 has 4 divisors (see below), whose sum is σ = 1122370116. Its totient is φ = 962031504.

The previous prime is 1042200791. The next prime is 1042200821. The reversal of 1042200809 is 9080022401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9080022401 = 41 ⋅221463961.

It can be written as a sum of positive squares in 2 ways, for example, as 510760000 + 531440809 = 22600^2 + 23053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042200809 - 2¹⁶ = 1042135273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1042202809) 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, 40084634 + ... + 40084659.

It is an arithmetic number, because the mean of its divisors is an integer number (280592529).

Almost surely, 2^1042200809 is an apocalyptic number.

It is an amenable number.

1042200809 is a deficient number, since it is larger than the sum of its proper divisors (80169307).

1042200809 is an equidigital number, since it uses as much as digits as its factorization.

1042200809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80169306.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1042200809 is about 32283.1350553195. The cubic root of 1042200809 is about 1013.8735702717.

The spelling of 1042200809 in words is "one billion, forty-two million, two hundred thousand, eight hundred nine".