1813207988 has 12 divisors (see below), whose sum is σ = 3185462532. Its totient is φ = 903075840.

The previous prime is 1813207987. The next prime is 1813207999. The reversal of 1813207988 is 8897023181.

It can be written as a sum of positive squares in 2 ways, for example, as 1739557264 + 73650724 = 41708^2 + 8582^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813207987) 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, 880883 + ... + 882938.

It is an arithmetic number, because the mean of its divisors is an integer number (265455211).

Almost surely, 2^1813207988 is an apocalyptic number.

It is an amenable number.

1813207988 is a deficient number, since it is larger than the sum of its proper divisors (1372254544).

1813207988 is a wasteful number, since it uses less digits than its factorization.

1813207988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764082 (or 1764080 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 1813207988 is about 42581.7800003711. The cubic root of 1813207988 is about 1219.4084716366.

The spelling of 1813207988 in words is "one billion, eight hundred thirteen million, two hundred seven thousand, nine hundred eighty-eight".