1918281912 has 32 divisors (see below), whose sum is σ = 4797636480. Its totient is φ = 639169760.

The previous prime is 1918281907. The next prime is 1918281917. The reversal of 1918281912 is 2191828191.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1918281907) and next prime (1918281917).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918281917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50323 + ... + 79805.

It is an arithmetic number, because the mean of its divisors is an integer number (149926140).

Almost surely, 2^1918281912 is an apocalyptic number.

1918281912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1918281912 is an abundant number, since it is smaller than the sum of its proper divisors (2879354568).

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

1918281912 is a wasteful number, since it uses less digits than its factorization.

1918281912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32203 (or 32199 counting only the distinct ones).

The product of its digits is 20736, while the sum is 42.

The square root of 1918281912 is about 43798.1953052863. The cubic root of 1918281912 is about 1242.5221626568.

The spelling of 1918281912 in words is "one billion, nine hundred eighteen million, two hundred eighty-one thousand, nine hundred twelve".