1918874445 has 16 divisors (see below), whose sum is σ = 3071561472. Its totient is φ = 1022945600.

The previous prime is 1918874401. The next prime is 1918874449. The reversal of 1918874445 is 5444788191.

It is not a de Polignac number, because 1918874445 - 2⁷ = 1918874317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918874449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8059 + ... + 62471.

It is an arithmetic number, because the mean of its divisors is an integer number (191972592).

Almost surely, 2^1918874445 is an apocalyptic number.

1918874445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1918874445 is a deficient number, since it is larger than the sum of its proper divisors (1152687027).

1918874445 is a wasteful number, since it uses less digits than its factorization.

1918874445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56772.

The product of its digits is 1290240, while the sum is 51.

The square root of 1918874445 is about 43804.9591370657. The cubic root of 1918874445 is about 1242.6500826092.

The spelling of 1918874445 in words is "one billion, nine hundred eighteen million, eight hundred seventy-four thousand, four hundred forty-five".