38009681 has 4 divisors (see below), whose sum is σ = 38180352. Its totient is φ = 37839012.

The previous prime is 38009677. The next prime is 38009687. The reversal of 38009681 is 18690083.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18690083 = 853 ⋅21911.

It is a cyclic number.

It is not a de Polignac number, because 38009681 - 2² = 38009677 is a prime.

It is a super-2 number, since 2×38009681² = 2889471699443522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38009687) 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, 85001 + ... + 85446.

It is an arithmetic number, because the mean of its divisors is an integer number (9545088).

Almost surely, 2^38009681 is an apocalyptic number.

It is an amenable number.

38009681 is a deficient number, since it is larger than the sum of its proper divisors (170671).

38009681 is a wasteful number, since it uses less digits than its factorization.

38009681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170670.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 38009681 is about 6165.1991857522. The cubic root of 38009681 is about 336.2260885048.

The spelling of 38009681 in words is "thirty-eight million, nine thousand, six hundred eighty-one".