38209857 has 32 divisors (see below), whose sum is σ = 60364800. Its totient is φ = 21485520.

The previous prime is 38209823. The next prime is 38209859. The reversal of 38209857 is 75890283.

It is not a de Polignac number, because 38209857 - 2¹¹ = 38207809 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (38209859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72798 + ... + 73320.

It is an arithmetic number, because the mean of its divisors is an integer number (1886400).

Almost surely, 2^38209857 is an apocalyptic number.

It is an amenable number.

38209857 is a deficient number, since it is larger than the sum of its proper divisors (22154943).

38209857 is an equidigital number, since it uses as much as digits as its factorization.

38209857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 38209857 is about 6181.4122172850. The cubic root of 38209857 is about 336.8152944168.

The spelling of 38209857 in words is "thirty-eight million, two hundred nine thousand, eight hundred fifty-seven".