38399881 has 4 divisors (see below), whose sum is σ = 41353732. Its totient is φ = 35446032.

The previous prime is 38399873. The next prime is 38399909. The reversal of 38399881 is 18899383.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18899383 = 97 ⋅194839.

It can be written as a sum of positive squares in 2 ways, for example, as 11526025 + 26873856 = 3395^2 + 5184^2 .

It is a cyclic number.

It is not a de Polignac number, because 38399881 - 2³ = 38399873 is a prime.

It is a super-2 number, since 2×38399881² = 2949101721628322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38399861) 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, 1476906 + ... + 1476931.

It is an arithmetic number, because the mean of its divisors is an integer number (10338433).

Almost surely, 2^38399881 is an apocalyptic number.

It is an amenable number.

38399881 is a deficient number, since it is larger than the sum of its proper divisors (2953851).

38399881 is a wasteful number, since it uses less digits than its factorization.

38399881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953850.

The product of its digits is 373248, while the sum is 49.

The square root of 38399881 is about 6196.7637521532. The cubic root of 38399881 is about 337.3727176186.

The spelling of 38399881 in words is "thirty-eight million, three hundred ninety-nine thousand, eight hundred eighty-one".