38801681 has 4 divisors (see below), whose sum is σ = 40139700. Its totient is φ = 37463664.

The previous prime is 38801663. The next prime is 38801683. The reversal of 38801681 is 18610883.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23435281 + 15366400 = 4841^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 38801681 - 2¹⁴ = 38785297 is a prime.

It is a super-2 number, since 2×38801681² = 3011140896851522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38801683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668966 + ... + 669023.

It is an arithmetic number, because the mean of its divisors is an integer number (10034925).

Almost surely, 2^38801681 is an apocalyptic number.

It is an amenable number.

38801681 is a deficient number, since it is larger than the sum of its proper divisors (1338019).

38801681 is a wasteful number, since it uses less digits than its factorization.

38801681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338018.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 38801681 is about 6229.0995336405. The cubic root of 38801681 is about 338.5453452632.

The spelling of 38801681 in words is "thirty-eight million, eight hundred one thousand, six hundred eighty-one".