1918375398 has 24 divisors (see below), whose sum is σ = 4337197488. Its totient is φ = 611655792.

The previous prime is 1918375391. The next prime is 1918375409. The reversal of 1918375398 is 8935738191.

1918375398 is a `hidden beast` number, since 1 + 9 + 183 + 75 + 398 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918375391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2316465 + ... + 2317292.

It is an arithmetic number, because the mean of its divisors is an integer number (180716562).

Almost surely, 2^1918375398 is an apocalyptic number.

1918375398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1918375398 is an abundant number, since it is smaller than the sum of its proper divisors (2418822090).

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

1918375398 is a wasteful number, since it uses less digits than its factorization.

1918375398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4633788 (or 4633785 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1918375398 is about 43799.2625280381. The cubic root of 1918375398 is about 1242.5423467843.

The spelling of 1918375398 in words is "one billion, nine hundred eighteen million, three hundred seventy-five thousand, three hundred ninety-eight".