1318813820 has 12 divisors (see below), whose sum is σ = 2769509064. Its totient is φ = 527525520.

The previous prime is 1318813817. The next prime is 1318813823. The reversal of 1318813820 is 283188131.

It is an interprime number because it is at equal distance from previous prime (1318813817) and next prime (1318813823).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318813823) 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, 32970326 + ... + 32970365.

It is an arithmetic number, because the mean of its divisors is an integer number (230792422).

Almost surely, 2^1318813820 is an apocalyptic number.

1318813820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318813820 is an abundant number, since it is smaller than the sum of its proper divisors (1450695244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1318813820 is a wasteful number, since it uses less digits than its factorization.

1318813820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65940700 (or 65940698 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1318813820 is about 36315.4763152020. The cubic root of 1318813820 is about 1096.6326277789.

The spelling of 1318813820 in words is "one billion, three hundred eighteen million, eight hundred thirteen thousand, eight hundred twenty".