38306981 has 4 divisors (see below), whose sum is σ = 38586732. Its totient is φ = 38027232.

The previous prime is 38306953. The next prime is 38306987. The reversal of 38306981 is 18960383.

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 29604481 + 8702500 = 5441^2 + 2950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38306981 is a prime.

It is a super-2 number, since 2×38306981² = 2934849586668722, 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 (38306987) 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, 139670 + ... + 139943.

It is an arithmetic number, because the mean of its divisors is an integer number (9646683).

Almost surely, 2^38306981 is an apocalyptic number.

It is an amenable number.

38306981 is a deficient number, since it is larger than the sum of its proper divisors (279751).

38306981 is a wasteful number, since it uses less digits than its factorization.

38306981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279750.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 38306981 is about 6189.2633648925. The cubic root of 38306981 is about 337.1004317537.

The spelling of 38306981 in words is "thirty-eight million, three hundred six thousand, nine hundred eighty-one".