1810240906 has 4 divisors (see below), whose sum is σ = 2715361362. Its totient is φ = 905120452.

The previous prime is 1810240879. The next prime is 1810240909. The reversal of 1810240906 is 6090420181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1598800225 + 211440681 = 39985^2 + 14541^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1810240909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452560225 + ... + 452560228.

Almost surely, 2^1810240906 is an apocalyptic number.

1810240906 is a deficient number, since it is larger than the sum of its proper divisors (905120456).

1810240906 is an equidigital number, since it uses as much as digits as its factorization.

1810240906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905120455.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1810240906 is about 42546.9259289082. The cubic root of 1810240906 is about 1218.7429733857.

The spelling of 1810240906 in words is "one billion, eight hundred ten million, two hundred forty thousand, nine hundred six".