1918438074 has 32 divisors (see below), whose sum is σ = 4872224640. Its totient is φ = 548125056.

The previous prime is 1918438061. The next prime is 1918438079. The reversal of 1918438074 is 4708348191.

It is a happy number.

1918438074 is a `hidden beast` number, since 191 + 84 + 380 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1918438079) 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, 2537239 + ... + 2537994.

It is an arithmetic number, because the mean of its divisors is an integer number (152257020).

Almost surely, 2^1918438074 is an apocalyptic number.

1918438074 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1918438074 is an abundant number, since it is smaller than the sum of its proper divisors (2953786566).

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

1918438074 is a wasteful number, since it uses less digits than its factorization.

1918438074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075251 (or 5075245 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1918438074 is about 43799.9780136931. The cubic root of 1918438074 is about 1242.5558785007. Note that the first 3 decimals are identical.

The spelling of 1918438074 in words is "one billion, nine hundred eighteen million, four hundred thirty-eight thousand, seventy-four".