1918731974 has 16 divisors (see below), whose sum is σ = 2948744736. Its totient is φ = 936096000.

The previous prime is 1918731973. The next prime is 1918732009. The reversal of 1918731974 is 4791378191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918731973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55877 + ... + 83424.

It is an arithmetic number, because the mean of its divisors is an integer number (184296546).

Almost surely, 2^1918731974 is an apocalyptic number.

1918731974 is a deficient number, since it is larger than the sum of its proper divisors (1030012762).

1918731974 is a wasteful number, since it uses less digits than its factorization.

1918731974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139471.

The product of its digits is 381024, while the sum is 50.

The square root of 1918731974 is about 43803.3329097227. The cubic root of 1918731974 is about 1242.6193274301.

The spelling of 1918731974 in words is "one billion, nine hundred eighteen million, seven hundred thirty-one thousand, nine hundred seventy-four".