38604781 has 2 divisors, whose sum is σ = 38604782. Its totient is φ = 38604780.

The previous prime is 38604779. The next prime is 38604803. The reversal of 38604781 is 18740683.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 585225 = 6166^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 38604781 - 2¹ = 38604779 is a prime.

It is a super-2 number, since 2×38604781² = 2980658232115922, which contains 22 as substring.

Together with 38604779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 38604781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38604721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19302390 + 19302391.

It is an arithmetic number, because the mean of its divisors is an integer number (19302391).

Almost surely, 2^38604781 is an apocalyptic number.

It is an amenable number.

38604781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38604781 is an equidigital number, since it uses as much as digits as its factorization.

38604781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 38604781 is about 6213.2745794790. The cubic root of 38604781 is about 337.9717218969.

The spelling of 38604781 in words is "thirty-eight million, six hundred four thousand, seven hundred eighty-one".