384969681 has 12 divisors (see below), whose sum is σ = 561574260. Its totient is φ = 254104800.

The previous prime is 384969677. The next prime is 384969691. The reversal of 384969681 is 186969483.

It can be written as a sum of positive squares in 2 ways, for example, as 368640000 + 16329681 = 19200^2 + 4041^2 .

It is not a de Polignac number, because 384969681 - 2² = 384969677 is a prime.

It is a super-2 number, since 2×384969681² = 296403310578483522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (384969601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210846 + ... + 212663.

It is an arithmetic number, because the mean of its divisors is an integer number (46797855).

Almost surely, 2^384969681 is an apocalyptic number.

It is an amenable number.

384969681 is a deficient number, since it is larger than the sum of its proper divisors (176604579).

384969681 is a wasteful number, since it uses less digits than its factorization.

384969681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423616 (or 423613 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 384969681 is about 19620.6442554774. The cubic root of 384969681 is about 727.4595379062.

The spelling of 384969681 in words is "three hundred eighty-four million, nine hundred sixty-nine thousand, six hundred eighty-one".