38913557 has 2 divisors, whose sum is σ = 38913558. Its totient is φ = 38913556.

The previous prime is 38913541. The next prime is 38913569. The reversal of 38913557 is 75531983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37039396 + 1874161 = 6086^2 + 1369^2 .

It is an emirp because it is prime and its reverse (75531983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38913557 - 2⁴ = 38913541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38913257) 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 as a sum of consecutive naturals, namely, 19456778 + 19456779.

It is an arithmetic number, because the mean of its divisors is an integer number (19456779).

Almost surely, 2^38913557 is an apocalyptic number.

It is an amenable number.

38913557 is a deficient number, since it is larger than the sum of its proper divisors (1).

38913557 is an equidigital number, since it uses as much as digits as its factorization.

38913557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 38913557 is about 6238.0731800773. The cubic root of 38913557 is about 338.8704064014.

The spelling of 38913557 in words is "thirty-eight million, nine hundred thirteen thousand, five hundred fifty-seven".