38920081 has 4 divisors (see below), whose sum is σ = 38992564. Its totient is φ = 38847600.

The previous prime is 38920067. The next prime is 38920093. The reversal of 38920081 is 18002983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18002983 = 17 ⋅1058999.

It can be written as a sum of positive squares in 2 ways, for example, as 10660225 + 28259856 = 3265^2 + 5316^2 .

It is a cyclic number.

It is not a de Polignac number, because 38920081 - 2²⁵ = 5365649 is a prime.

It is a super-2 number, since 2×38920081² = 3029545410093122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38920051) 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, 35430 + ... + 36511.

It is an arithmetic number, because the mean of its divisors is an integer number (9748141).

Almost surely, 2^38920081 is an apocalyptic number.

It is an amenable number.

38920081 is a deficient number, since it is larger than the sum of its proper divisors (72483).

38920081 is an equidigital number, since it uses as much as digits as its factorization.

38920081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72482.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 38920081 is about 6238.5960760415. The cubic root of 38920081 is about 338.8893429637.

The spelling of 38920081 in words is "thirty-eight million, nine hundred twenty thousand, eighty-one".