1218025780 has 24 divisors (see below), whose sum is σ = 2692478880. Its totient is φ = 461567520.

The previous prime is 1218025771. The next prime is 1218025793. The reversal of 1218025780 is 875208121.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 1602286 + ... + 1603045.

It is an arithmetic number, because the mean of its divisors is an integer number (112186620).

Almost surely, 2^1218025780 is an apocalyptic number.

1218025780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218025780 is an abundant number, since it is smaller than the sum of its proper divisors (1474453100).

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

1218025780 is a wasteful number, since it uses less digits than its factorization.

1218025780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205359 (or 3205357 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 1218025780 is about 34900.2260737663. The cubic root of 1218025780 is about 1067.9530493652.

The spelling of 1218025780 in words is "one billion, two hundred eighteen million, twenty-five thousand, seven hundred eighty".