781084947 has 16 divisors (see below), whose sum is σ = 1053381888. Its totient is φ = 514773600.

The previous prime is 781084921. The next prime is 781084957. The reversal of 781084947 is 749480187.

781084947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 781084947 - 2¹¹ = 781082899 is a prime.

It is a super-2 number, since 2×781084947² = 1220187388859985618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781084896 and 781084905.

It is not an unprimeable number, because it can be changed into a prime (781084957) 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, 209197 + ... + 212897.

It is an arithmetic number, because the mean of its divisors is an integer number (65836368).

Almost surely, 2^781084947 is an apocalyptic number.

781084947 is a deficient number, since it is larger than the sum of its proper divisors (272296941).

781084947 is a wasteful number, since it uses less digits than its factorization.

781084947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490.

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 781084947 is about 27947.8970049626. The cubic root of 781084947 is about 920.9430103105.

The spelling of 781084947 in words is "seven hundred eighty-one million, eighty-four thousand, nine hundred forty-seven".