1918748438 has 8 divisors (see below), whose sum is σ = 2878543632. Its totient is φ = 959233896.

The previous prime is 1918748437. The next prime is 1918748467. The reversal of 1918748438 is 8348478191.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1918748438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918748437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52145 + ... + 80972.

It is an arithmetic number, because the mean of its divisors is an integer number (359817954).

Almost surely, 2^1918748438 is an apocalyptic number.

1918748438 is a deficient number, since it is larger than the sum of its proper divisors (959795194).

1918748438 is a wasteful number, since it uses less digits than its factorization.

1918748438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140326.

The product of its digits is 1548288, while the sum is 53.

The square root of 1918748438 is about 43803.5208402247. The cubic root of 1918748438 is about 1242.6228815875.

The spelling of 1918748438 in words is "one billion, nine hundred eighteen million, seven hundred forty-eight thousand, four hundred thirty-eight".