38649636 has 72 divisors (see below), whose sum is σ = 107321760. Its totient is φ = 12120192.

The previous prime is 38649623. The next prime is 38649641. The reversal of 38649636 is 63694683.

38649636 is a `hidden beast` number, since 3 + 8 + 6 + 4 + 9 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 38649591 and 38649600.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15355 + ... + 17693.

It is an arithmetic number, because the mean of its divisors is an integer number (1490580).

Almost surely, 2^38649636 is an apocalyptic number.

38649636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38649636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53660880).

38649636 is an abundant number, since it is smaller than the sum of its proper divisors (68672124).

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

38649636 is a wasteful number, since it uses less digits than its factorization.

38649636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375 (or 2361 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 38649636 is about 6216.8831418967. The cubic root of 38649636 is about 338.1025679874.

The spelling of 38649636 in words is "thirty-eight million, six hundred forty-nine thousand, six hundred thirty-six".