38199681 has 20 divisors (see below), whose sum is σ = 61454932. Its totient is φ = 23506848.

The previous prime is 38199653. The next prime is 38199683. The reversal of 38199681 is 18699183.

It can be written as a sum of positive squares in 2 ways, for example, as 18352656 + 19847025 = 4284^2 + 4455^2 .

It is not a de Polignac number, because 38199681 - 2⁹ = 38199169 is a prime.

It is a super-2 number, since 2×38199681² = 2918431257003522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38199683) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17086 + ... + 19191.

Almost surely, 2^38199681 is an apocalyptic number.

It is an amenable number.

38199681 is a deficient number, since it is larger than the sum of its proper divisors (23255251).

38199681 is a wasteful number, since it uses less digits than its factorization.

38199681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36302 (or 36293 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 38199681 is about 6180.5890495971. The cubic root of 38199681 is about 336.7853916900.

The spelling of 38199681 in words is "thirty-eight million, one hundred ninety-nine thousand, six hundred eighty-one".