38661636 has 48 divisors (see below), whose sum is σ = 99235584. Its totient is φ = 11640576.

The previous prime is 38661631. The next prime is 38661653. The reversal of 38661636 is 63616683.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 38661594 and 38661603.

It is not an unprimeable number, because it can be changed into a prime (38661631) 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, 4696 + ... + 9968.

It is an arithmetic number, because the mean of its divisors is an integer number (2067408).

Almost surely, 2^38661636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38661636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49617792).

38661636 is an abundant number, since it is smaller than the sum of its proper divisors (60573948).

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

38661636 is a wasteful number, since it uses less digits than its factorization.

38661636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340 (or 5338 counting only the distinct ones).

The product of its digits is 93312, while the sum is 39.

The square root of 38661636 is about 6217.8481808420. The cubic root of 38661636 is about 338.1375559063.

The spelling of 38661636 in words is "thirty-eight million, six hundred sixty-one thousand, six hundred thirty-six".