1018939840 has 112 divisors (see below), whose sum is σ = 2509040448. Its totient is φ = 393928704.

The previous prime is 1018939811. The next prime is 1018939843. The reversal of 1018939840 is 489398101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018939843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237669 + ... + 1238491.

Almost surely, 2^1018939840 is an apocalyptic number.

1018939840 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 1018939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254520224).

1018939840 is an abundant number, since it is smaller than the sum of its proper divisors (1490100608).

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

1018939840 is an equidigital number, since it uses as much as digits as its factorization.

1018939840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1018939840 is about 31920.8370817559. The cubic root of 1018939840 is about 1006.2738366587.

The spelling of 1018939840 in words is "one billion, eighteen million, nine hundred thirty-nine thousand, eight hundred forty".