1918923005 has 16 divisors (see below), whose sum is σ = 2404975104. Its totient is φ = 1467079680.

The previous prime is 1918923001. The next prime is 1918923073. The reversal of 1918923005 is 5003298191.

It is not a de Polignac number, because 1918923005 - 2² = 1918923001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1918923005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918923001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133100 + ... + 146810.

It is an arithmetic number, because the mean of its divisors is an integer number (150310944).

Almost surely, 2^1918923005 is an apocalyptic number.

It is an amenable number.

1918923005 is a deficient number, since it is larger than the sum of its proper divisors (486052099).

1918923005 is a wasteful number, since it uses less digits than its factorization.

1918923005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14956.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1918923005 is about 43805.5134087023. The cubic root of 1918923005 is about 1242.6605648964.

The spelling of 1918923005 in words is "one billion, nine hundred eighteen million, nine hundred twenty-three thousand, five".