847989747 has 24 divisors (see below), whose sum is σ = 1341465840. Its totient is φ = 511918080.

The previous prime is 847989739. The next prime is 847989773. The reversal of 847989747 is 747989748.

It is a happy number.

It is not a de Polignac number, because 847989747 - 2³ = 847989739 is a prime.

It is a super-2 number, since 2×847989747² = 1438173222034248018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (847989787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8779 + ... + 42107.

It is an arithmetic number, because the mean of its divisors is an integer number (55894410).

Almost surely, 2^847989747 is an apocalyptic number.

847989747 is a deficient number, since it is larger than the sum of its proper divisors (493476093).

847989747 is a wasteful number, since it uses less digits than its factorization.

847989747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33603 (or 33600 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The square root of 847989747 is about 29120.2635118572. The cubic root of 847989747 is about 946.5208834698.

Subtracting from 847989747 its reverse (747989748), we obtain a palindrome (99999999).

The spelling of 847989747 in words is "eight hundred forty-seven million, nine hundred eighty-nine thousand, seven hundred forty-seven".