1918299840 has 224 divisors, whose sum is σ = 6380414976. Its totient is φ = 487710720.

The previous prime is 1918299833. The next prime is 1918299899. The reversal of 1918299840 is 489928191.

1918299840 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1918299840² = 7359748552288051200, which contains 22 as substring.

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, 2172039 + ... + 2172921.

Almost surely, 2^1918299840 is an apocalyptic number.

1918299840 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 1918299840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3190207488).

1918299840 is an abundant number, since it is smaller than the sum of its proper divisors (4462115136).

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

1918299840 is a wasteful number, since it uses less digits than its factorization.

1918299840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 51.

The square root of 1918299840 is about 43798.3999707752. The cubic root of 1918299840 is about 1242.5260334587.

The spelling of 1918299840 in words is "one billion, nine hundred eighteen million, two hundred ninety-nine thousand, eight hundred forty".