38781999 has 24 divisors (see below), whose sum is σ = 57198960. Its totient is φ = 25316352.

The previous prime is 38781949. The next prime is 38782027. The reversal of 38781999 is 99918783.

It is a de Polignac number, because none of the positive numbers 2^k-38781999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38781949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144037 + ... + 144305.

It is an arithmetic number, because the mean of its divisors is an integer number (2383290).

Almost surely, 2^38781999 is an apocalyptic number.

38781999 is a deficient number, since it is larger than the sum of its proper divisors (18416961).

38781999 is a wasteful number, since it uses less digits than its factorization.

38781999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 548 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 38781999 is about 6227.5194901341. The cubic root of 38781999 is about 338.4880936505.

The spelling of 38781999 in words is "thirty-eight million, seven hundred eighty-one thousand, nine hundred ninety-nine".