1818196980 has 48 divisors (see below), whose sum is σ = 5094870144. Its totient is φ = 484479360.

The previous prime is 1818196979. The next prime is 1818196987. The reversal of 1818196980 is 896918181.

It is a super-2 number, since 2×1818196980² = 6611680516162240800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818196987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71889 + ... + 93831.

It is an arithmetic number, because the mean of its divisors is an integer number (106143128).

Almost surely, 2^1818196980 is an apocalyptic number.

1818196980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818196980 is an abundant number, since it is smaller than the sum of its proper divisors (3276673164).

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

1818196980 is a wasteful number, since it uses less digits than its factorization.

1818196980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23336 (or 23334 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 51.

The square root of 1818196980 is about 42640.3210588288. The cubic root of 1818196980 is about 1220.5258371064.

The spelling of 1818196980 in words is "one billion, eight hundred eighteen million, one hundred ninety-six thousand, nine hundred eighty".