38402557 has 2 divisors, whose sum is σ = 38402558. Its totient is φ = 38402556.

The previous prime is 38402549. The next prime is 38402587. The reversal of 38402557 is 75520483.

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., 23145721 + 15256836 = 4811^2 + 3906^2 .

It is a cyclic number.

It is not a de Polignac number, because 38402557 - 2³ = 38402549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38402537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19201278 + 19201279.

It is an arithmetic number, because the mean of its divisors is an integer number (19201279).

Almost surely, 2^38402557 is an apocalyptic number.

It is an amenable number.

38402557 is a deficient number, since it is larger than the sum of its proper divisors (1).

38402557 is an equidigital number, since it uses as much as digits as its factorization.

38402557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 38402557 is about 6196.9796675477. The cubic root of 38402557 is about 337.3805543480.

The spelling of 38402557 in words is "thirty-eight million, four hundred two thousand, five hundred fifty-seven".