38943921636 has 36 divisors (see below), whose sum is σ = 102087566672. Its totient is φ = 12981306888.

The previous prime is 38943921631. The next prime is 38943921637. The reversal of 38943921636 is 63612934983.

38943921636 is a `hidden beast` number, since 3 + 8 + 94 + 392 + 163 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (38943921631) 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, 20031910 + ... + 20033853.

Almost surely, 2^38943921636 is an apocalyptic number.

38943921636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

38943921636 is an abundant number, since it is smaller than the sum of its proper divisors (63143645036).

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

38943921636 is a wasteful number, since it uses less digits than its factorization.

38943921636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40065782 (or 40065768 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 54.

The spelling of 38943921636 in words is "thirty-eight billion, nine hundred forty-three million, nine hundred twenty-one thousand, six hundred thirty-six".