38691973 has 4 divisors (see below), whose sum is σ = 39737740. Its totient is φ = 37646208.

The previous prime is 38691967. The next prime is 38691979. The reversal of 38691973 is 37919683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37919683 = 109 ⋅347887.

It is an interprime number because it is at equal distance from previous prime (38691967) and next prime (38691979).

It can be written as a sum of positive squares in 2 ways, for example, as 36566209 + 2125764 = 6047^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 38691973 - 2⁹ = 38691461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38691979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522828 + ... + 522901.

It is an arithmetic number, because the mean of its divisors is an integer number (9934435).

Almost surely, 2^38691973 is an apocalyptic number.

It is an amenable number.

38691973 is a deficient number, since it is larger than the sum of its proper divisors (1045767).

38691973 is a wasteful number, since it uses less digits than its factorization.

38691973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045766.

The product of its digits is 244944, while the sum is 46.

The square root of 38691973 is about 6220.2872120184. The cubic root of 38691973 is about 338.2259760057.

The spelling of 38691973 in words is "thirty-eight million, six hundred ninety-one thousand, nine hundred seventy-three".