1071865840 has 20 divisors (see below), whose sum is σ = 2492088264. Its totient is φ = 428746304.

The previous prime is 1071865819. The next prime is 1071865853. The reversal of 1071865840 is 485681701.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1071865840² = 2297792757917811200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1071865793 and 1071865802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6699082 + ... + 6699241.

Almost surely, 2^1071865840 is an apocalyptic number.

1071865840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1071865840 is an abundant number, since it is smaller than the sum of its proper divisors (1420222424).

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

1071865840 is a wasteful number, since it uses less digits than its factorization.

1071865840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13398336 (or 13398330 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 1071865840 is about 32739.3622418031. The cubic root of 1071865840 is about 1023.4032931006.

The spelling of 1071865840 in words is "one billion, seventy-one million, eight hundred sixty-five thousand, eight hundred forty".