38718381 has 16 divisors (see below), whose sum is σ = 55711040. Its totient is φ = 23777280.

The previous prime is 38718377. The next prime is 38718443. The reversal of 38718381 is 18381783.

It is not a de Polignac number, because 38718381 - 2² = 38718377 is a prime.

It is a super-2 number, since 2×38718381² = 2998226054522322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38718331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29346 + ... + 30636.

It is an arithmetic number, because the mean of its divisors is an integer number (3481940).

Almost surely, 2^38718381 is an apocalyptic number.

It is an amenable number.

38718381 is a deficient number, since it is larger than the sum of its proper divisors (16992659).

38718381 is a wasteful number, since it uses less digits than its factorization.

38718381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076.

The product of its digits is 32256, while the sum is 39.

The square root of 38718381 is about 6222.4095815046. The cubic root of 38718381 is about 338.3029070381.

The spelling of 38718381 in words is "thirty-eight million, seven hundred eighteen thousand, three hundred eighty-one".