1813385788 has 12 divisors (see below), whose sum is σ = 3189535272. Its totient is φ = 902090000.

The previous prime is 1813385779. The next prime is 1813385807. The reversal of 1813385788 is 8875833181.

It is a super-2 number, since 2×1813385788² = 6576736032240761888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1149838 + ... + 1151413.

It is an arithmetic number, because the mean of its divisors is an integer number (265794606).

Almost surely, 2^1813385788 is an apocalyptic number.

It is an amenable number.

1813385788 is a deficient number, since it is larger than the sum of its proper divisors (1376149484).

1813385788 is a wasteful number, since it uses less digits than its factorization.

1813385788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301452 (or 2301450 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 52.

The square root of 1813385788 is about 42583.8676965820. The cubic root of 1813385788 is about 1219.4483280203.

The spelling of 1813385788 in words is "one billion, eight hundred thirteen million, three hundred eighty-five thousand, seven hundred eighty-eight".