1047665840 has 160 divisors (see below), whose sum is σ = 2716701120. Its totient is φ = 373321728.

The previous prime is 1047665837. The next prime is 1047665881. The reversal of 1047665840 is 485667401.

1047665840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 4574846 + ... + 4575074.

It is an arithmetic number, because the mean of its divisors is an integer number (16979382).

Almost surely, 2^1047665840 is an apocalyptic number.

1047665840 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 1047665840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1358350560).

1047665840 is an abundant number, since it is smaller than the sum of its proper divisors (1669035280).

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

1047665840 is a wasteful number, since it uses less digits than its factorization.

1047665840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 1047665840 is about 32367.6665825635. Note that the first 3 decimals coincide. The cubic root of 1047665840 is about 1015.6426451088.

The spelling of 1047665840 in words is "one billion, forty-seven million, six hundred sixty-five thousand, eight hundred forty".