1918623136 has 12 divisors (see below), whose sum is σ = 3777289362. Its totient is φ = 959311552.

The previous prime is 1918623101. The next prime is 1918623137. The reversal of 1918623136 is 6313268191.

It can be written as a sum of positive squares in only one way, i.e., 1864512400 + 54110736 = 43180^2 + 7356^2 .

It is a super-2 number, since 2×1918623136² = 7362229475988948992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1918623137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29978455 + ... + 29978518.

Almost surely, 2^1918623136 is an apocalyptic number.

1918623136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1918623136 is a deficient number, since it is larger than the sum of its proper divisors (1858666226).

1918623136 is an equidigital number, since it uses as much as digits as its factorization.

1918623136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59956983 (or 59956975 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 1918623136 is about 43802.0905437172. The cubic root of 1918623136 is about 1242.5958315725.

The spelling of 1918623136 in words is "one billion, nine hundred eighteen million, six hundred twenty-three thousand, one hundred thirty-six".