1918369440 has 192 divisors, whose sum is σ = 7230988800. Its totient is φ = 472200192.

The previous prime is 1918369433. The next prime is 1918369469. The reversal of 1918369440 is 449638191.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39081 + ... + 73239.

It is an arithmetic number, because the mean of its divisors is an integer number (37661400).

Almost surely, 2^1918369440 is an apocalyptic number.

1918369440 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 1918369440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3615494400).

1918369440 is an abundant number, since it is smaller than the sum of its proper divisors (5312619360).

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

1918369440 is a wasteful number, since it uses less digits than its factorization.

1918369440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34196 (or 34182 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1918369440 is about 43799.1945131414. The cubic root of 1918369440 is about 1242.5410604397.

The spelling of 1918369440 in words is "one billion, nine hundred eighteen million, three hundred sixty-nine thousand, four hundred forty".