2385685638 has 144 divisors (see below), whose sum is σ = 6548958000. Its totient is φ = 623355264.

The previous prime is 2385685613. The next prime is 2385685639. The reversal of 2385685638 is 8365865832.

2385685638 is a `hidden beast` number, since 23 + 8 + 56 + 8 + 563 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2385685639) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 483528 + ... + 488436.

It is an arithmetic number, because the mean of its divisors is an integer number (45478875).

Almost surely, 2^2385685638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2385685638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3274479000).

2385685638 is an abundant number, since it is smaller than the sum of its proper divisors (4163272362).

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

2385685638 is a wasteful number, since it uses less digits than its factorization.

2385685638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4979 (or 4969 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The square root of 2385685638 is about 48843.4810184532. The cubic root of 2385685638 is about 1336.1987834990.

The spelling of 2385685638 in words is "two billion, three hundred eighty-five million, six hundred eighty-five thousand, six hundred thirty-eight".