1918647740 has 48 divisors (see below), whose sum is σ = 4263359520. Its totient is φ = 723271680.

The previous prime is 1918647733. The next prime is 1918647763. The reversal of 1918647740 is 477468191.

It is a happy 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, 60260 + ... + 86420.

It is an arithmetic number, because the mean of its divisors is an integer number (88819990).

Almost surely, 2^1918647740 is an apocalyptic number.

1918647740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918647740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2131679760).

1918647740 is an abundant number, since it is smaller than the sum of its proper divisors (2344711780).

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

1918647740 is a wasteful number, since it uses less digits than its factorization.

1918647740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26382 (or 26380 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 1918647740 is about 43802.3713969917. The cubic root of 1918647740 is about 1242.6011431415.

The spelling of 1918647740 in words is "one billion, nine hundred eighteen million, six hundred forty-seven thousand, seven hundred forty".