38971661 has 4 divisors (see below), whose sum is σ = 38989500. Its totient is φ = 38953824.

The previous prime is 38971651. The next prime is 38971711. The reversal of 38971661 is 16617983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16617983 = 23 ⋅722521.

It can be written as a sum of positive squares in 2 ways, for example, as 31024900 + 7946761 = 5570^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 38971661 - 2¹⁴ = 38955277 is a prime.

It is a super-3 number, since 3×38971661³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a deceptive number, since it divides R_38971660.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38971651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5096 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (9747375).

It is a Poulet number, since it divides 2^38971660-1.

Almost surely, 2^38971661 is an apocalyptic number.

It is an amenable number.

38971661 is a deficient number, since it is larger than the sum of its proper divisors (17839).

38971661 is a wasteful number, since it uses less digits than its factorization.

38971661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17838.

The product of its digits is 54432, while the sum is 41.

The square root of 38971661 is about 6242.7286501978. The cubic root of 38971661 is about 339.0389846193.

The spelling of 38971661 in words is "thirty-eight million, nine hundred seventy-one thousand, six hundred sixty-one".