38911381 has 4 divisors (see below), whose sum is σ = 39645612. Its totient is φ = 38177152.

The previous prime is 38911363. The next prime is 38911391. The reversal of 38911381 is 18311983.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30902481 + 8008900 = 5559^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 38911381 - 2⁵ = 38911349 is a prime.

It is a super-2 number, since 2×38911381² = 3028191142654322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38911321) 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, 367036 + ... + 367141.

It is an arithmetic number, because the mean of its divisors is an integer number (9911403).

Almost surely, 2^38911381 is an apocalyptic number.

It is an amenable number.

38911381 is a deficient number, since it is larger than the sum of its proper divisors (734231).

38911381 is an equidigital number, since it uses as much as digits as its factorization.

38911381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734230.

The product of its digits is 5184, while the sum is 34.

The square root of 38911381 is about 6237.8987648085. The cubic root of 38911381 is about 338.8640898731.

The spelling of 38911381 in words is "thirty-eight million, nine hundred eleven thousand, three hundred eighty-one".