1918142208 has 90 divisors (see below), whose sum is σ = 5719614824. Its totient is φ = 639373824.

The previous prime is 1918142203. The next prime is 1918142209. The reversal of 1918142208 is 8022418191.

It is a happy number.

It is a super-2 number, since 2×1918142208² = 7358539060222230528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918142203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 25516 + ... + 66987.

Almost surely, 2^1918142208 is an apocalyptic number.

1918142208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1918142208 is an abundant number, since it is smaller than the sum of its proper divisors (3801472616).

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

1918142208 is an frugal number, since it uses more digits than its factorization.

1918142208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92531 (or 92508 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1918142208 is about 43796.6004160140. The cubic root of 1918142208 is about 1242.4919985936.

The spelling of 1918142208 in words is "one billion, nine hundred eighteen million, one hundred forty-two thousand, two hundred eight".