38904993 has 12 divisors (see below), whose sum is σ = 59501988. Its totient is φ = 24410880.

The previous prime is 38904991. The next prime is 38904997. The reversal of 38904993 is 39940983.

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 21790224 = 4137^2 + 4668^2 .

It is not a de Polignac number, because 38904993 - 2¹ = 38904991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38904991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126988 + ... + 127293.

It is an arithmetic number, because the mean of its divisors is an integer number (4958499).

Almost surely, 2^38904993 is an apocalyptic number.

It is an amenable number.

38904993 is a deficient number, since it is larger than the sum of its proper divisors (20596995).

38904993 is a wasteful number, since it uses less digits than its factorization.

38904993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254304 (or 254301 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 38904993 is about 6237.3867123981. The cubic root of 38904993 is about 338.8455453221.

The spelling of 38904993 in words is "thirty-eight million, nine hundred four thousand, nine hundred ninety-three".