38987537 has 4 divisors (see below), whose sum is σ = 39041460. Its totient is φ = 38933616.

The previous prime is 38987521. The next prime is 38987549. The reversal of 38987537 is 73578983.

It is a Cunningham number, because it is equal to 6244²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73578983 = 331 ⋅222293.

It can be written as a sum of positive squares in 2 ways, for example, as 38142976 + 844561 = 6176^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 38987537 - 2⁴ = 38987521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38987587) 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, 25862 + ... + 27327.

It is an arithmetic number, because the mean of its divisors is an integer number (9760365).

Almost surely, 2^38987537 is an apocalyptic number.

It is an amenable number.

38987537 is a deficient number, since it is larger than the sum of its proper divisors (53923).

38987537 is an equidigital number, since it uses as much as digits as its factorization.

38987537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53922.

The product of its digits is 1270080, while the sum is 50.

The square root of 38987537 is about 6244.0000800769. Note that the first 4 decimals coincide. The cubic root of 38987537 is about 339.0850168047.

The spelling of 38987537 in words is "thirty-eight million, nine hundred eighty-seven thousand, five hundred thirty-seven".