1918858499 has 16 divisors (see below), whose sum is σ = 1966091616. Its totient is φ = 1872384000.

The previous prime is 1918858489. The next prime is 1918858541. The reversal of 1918858499 is 9948588191.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1918858499 - 2²⁰ = 1917809923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1918858489) 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 in 15 ways as a sum of consecutive naturals, for example, 2993219 + ... + 2993859.

It is an arithmetic number, because the mean of its divisors is an integer number (122880726).

Almost surely, 2^1918858499 is an apocalyptic number.

1918858499 is a deficient number, since it is larger than the sum of its proper divisors (47233117).

1918858499 is a wasteful number, since it uses less digits than its factorization.

1918858499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126.

The product of its digits is 7464960, while the sum is 62.

The square root of 1918858499 is about 43804.7771253319. Note that the first 3 decimals coincide. The cubic root of 1918858499 is about 1242.6466404259.

The spelling of 1918858499 in words is "one billion, nine hundred eighteen million, eight hundred fifty-eight thousand, four hundred ninety-nine".