1813206938 has 4 divisors (see below), whose sum is σ = 2719810410. Its totient is φ = 906603468.

The previous prime is 1813206911. The next prime is 1813206977. The reversal of 1813206938 is 8396023181.

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., 1636768849 + 176438089 = 40457^2 + 13283^2 .

It is a super-2 number, since 2×1813206938² = 6575438800022671688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1813206895 and 1813206904.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453301733 + ... + 453301736.

Almost surely, 2^1813206938 is an apocalyptic number.

1813206938 is a deficient number, since it is larger than the sum of its proper divisors (906603472).

1813206938 is an equidigital number, since it uses as much as digits as its factorization.

1813206938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906603471.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1813206938 is about 42581.7676711524. The cubic root of 1813206938 is about 1219.4082362565.

The spelling of 1813206938 in words is "one billion, eight hundred thirteen million, two hundred six thousand, nine hundred thirty-eight".