38387881 has 4 divisors (see below), whose sum is σ = 43871872. Its totient is φ = 32903892.

The previous prime is 38387879. The next prime is 38387903. The reversal of 38387881 is 18878383.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 38387881 - 2¹ = 38387879 is a prime.

It is a super-2 number, since 2×38387881² = 2947258815340322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38387081) 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, 2741985 + ... + 2741998.

It is an arithmetic number, because the mean of its divisors is an integer number (10967968).

Almost surely, 2^38387881 is an apocalyptic number.

It is an amenable number.

38387881 is a deficient number, since it is larger than the sum of its proper divisors (5483991).

38387881 is an equidigital number, since it uses as much as digits as its factorization.

38387881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5483990.

The product of its digits is 258048, while the sum is 46.

The square root of 38387881 is about 6195.7954291600. The cubic root of 38387881 is about 337.3375708569.

The spelling of 38387881 in words is "thirty-eight million, three hundred eighty-seven thousand, eight hundred eighty-one".