1071321840 has 240 divisors, whose sum is σ = 3844039680. Its totient is φ = 266595840.

The previous prime is 1071321829. The next prime is 1071321863. The reversal of 1071321840 is 481231701.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×1071321840² = 2295460969721971200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 970729 + ... + 971831.

It is an arithmetic number, because the mean of its divisors is an integer number (16016832).

Almost surely, 2^1071321840 is an apocalyptic number.

1071321840 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 1071321840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922019840).

1071321840 is an abundant number, since it is smaller than the sum of its proper divisors (2772717840).

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

1071321840 is a wasteful number, since it uses less digits than its factorization.

1071321840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1071321840 is about 32731.0531452931. The cubic root of 1071321840 is about 1023.2301291397.

The spelling of 1071321840 in words is "one billion, seventy-one million, three hundred twenty-one thousand, eight hundred forty".