38616521 has 4 divisors (see below), whose sum is σ = 38748612. Its totient is φ = 38484432.

The previous prime is 38616491. The next prime is 38616551. The reversal of 38616521 is 12561683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12561683 = 179 ⋅70177.

It is an interprime number because it is at equal distance from previous prime (38616491) and next prime (38616551).

It can be written as a sum of positive squares in 2 ways, for example, as 35940025 + 2676496 = 5995^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 38616521 - 2¹⁸ = 38354377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38616551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65606 + ... + 66191.

It is an arithmetic number, because the mean of its divisors is an integer number (9687153).

Almost surely, 2^38616521 is an apocalyptic number.

It is an amenable number.

38616521 is a deficient number, since it is larger than the sum of its proper divisors (132091).

38616521 is a wasteful number, since it uses less digits than its factorization.

38616521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132090.

The product of its digits is 8640, while the sum is 32.

The square root of 38616521 is about 6214.2192590864. The cubic root of 38616521 is about 338.0059783264.

The spelling of 38616521 in words is "thirty-eight million, six hundred sixteen thousand, five hundred twenty-one".