38399689 has 2 divisors, whose sum is σ = 38399690. Its totient is φ = 38399688.

The previous prime is 38399687. The next prime is 38399707. The reversal of 38399689 is 98699383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37307664 + 1092025 = 6108^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 38399689 - 2¹ = 38399687 is a prime.

It is a super-2 number, since 2×38399689² = 2949072230593442, which contains 22 as substring.

Together with 38399687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (38399687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19199844 + 19199845.

It is an arithmetic number, because the mean of its divisors is an integer number (19199845).

Almost surely, 2^38399689 is an apocalyptic number.

It is an amenable number.

38399689 is a deficient number, since it is larger than the sum of its proper divisors (1).

38399689 is an equidigital number, since it uses as much as digits as its factorization.

38399689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 55.

The square root of 38399689 is about 6196.7482601765. The cubic root of 38399689 is about 337.3721553281.

The spelling of 38399689 in words is "thirty-eight million, three hundred ninety-nine thousand, six hundred eighty-nine".