1918420125 has 16 divisors (see below), whose sum is σ = 3192251712. Its totient is φ = 1023157200.

The previous prime is 1918420073. The next prime is 1918420157. The reversal of 1918420125 is 5210248191.

It is not a de Polignac number, because 1918420125 - 2¹⁰ = 1918419101 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2557519 + ... + 2558268.

It is an arithmetic number, because the mean of its divisors is an integer number (199515732).

Almost surely, 2^1918420125 is an apocalyptic number.

1918420125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1918420125 is a deficient number, since it is larger than the sum of its proper divisors (1273831587).

1918420125 is an equidigital number, since it uses as much as digits as its factorization.

1918420125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115805 (or 5115795 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1918420125 is about 43799.7731158507. The cubic root of 1918420125 is about 1242.5520033509.

The spelling of 1918420125 in words is "one billion, nine hundred eighteen million, four hundred twenty thousand, one hundred twenty-five".