38684857 has 2 divisors, whose sum is σ = 38684858. Its totient is φ = 38684856.

The previous prime is 38684851. The next prime is 38684881. The reversal of 38684857 is 75848683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 18757561 = 4464^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 38684857 - 2⁷ = 38684729 is a prime.

It is a super-2 number, since 2×38684857² = 2993036322220898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38684857.

It is not a weakly prime, because it can be changed into another prime (38684851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19342428 + 19342429.

It is an arithmetic number, because the mean of its divisors is an integer number (19342429).

Almost surely, 2^38684857 is an apocalyptic number.

It is an amenable number.

38684857 is a deficient number, since it is larger than the sum of its proper divisors (1).

38684857 is an equidigital number, since it uses as much as digits as its factorization.

38684857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The square root of 38684857 is about 6219.7151864052. The cubic root of 38684857 is about 338.2052398907.

The spelling of 38684857 in words is "thirty-eight million, six hundred eighty-four thousand, eight hundred fifty-seven".