385643637 has 12 divisors (see below), whose sum is σ = 572096460. Its totient is φ = 250147008.

The previous prime is 385643633. The next prime is 385643641. The reversal of 385643637 is 736346583.

385643637 is a `hidden beast` number, since 3 + 8 + 5 + 6 + 4 + 3 + 637 = 666.

It is an interprime number because it is at equal distance from previous prime (385643633) and next prime (385643641).

It can be written as a sum of positive squares in 2 ways, for example, as 352913796 + 32729841 = 18786^2 + 5721^2 .

It is not a de Polignac number, because 385643637 - 2² = 385643633 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 385643592 and 385643601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385643633) 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, 578712 + ... + 579377.

It is an arithmetic number, because the mean of its divisors is an integer number (47674705).

Almost surely, 2^385643637 is an apocalyptic number.

385643637 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

385643637 is a deficient number, since it is larger than the sum of its proper divisors (186452823).

385643637 is a wasteful number, since it uses less digits than its factorization.

385643637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158132 (or 1158129 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 45.

The square root of 385643637 is about 19637.8114106435. The cubic root of 385643637 is about 727.8838049921.

The spelling of 385643637 in words is "three hundred eighty-five million, six hundred forty-three thousand, six hundred thirty-seven".