38787281 has 8 divisors (see below), whose sum is σ = 41940864. Its totient is φ = 35658000.

The previous prime is 38787257. The next prime is 38787283. The reversal of 38787281 is 18278783.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38787281 is a prime.

It is a super-2 number, since 2×38787281² = 3008906334745922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38787283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2681 + ... + 9206.

It is an arithmetic number, because the mean of its divisors is an integer number (5242608).

Almost surely, 2^38787281 is an apocalyptic number.

It is an amenable number.

38787281 is a deficient number, since it is larger than the sum of its proper divisors (3153583).

38787281 is a wasteful number, since it uses less digits than its factorization.

38787281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12151.

The product of its digits is 150528, while the sum is 44.

The square root of 38787281 is about 6227.9435610802. The cubic root of 38787281 is about 338.5034599973.

The spelling of 38787281 in words is "thirty-eight million, seven hundred eighty-seven thousand, two hundred eighty-one".