38989831 has 4 divisors (see below), whose sum is σ = 39459672. Its totient is φ = 38519992.

The previous prime is 38989817. The next prime is 38989883. The reversal of 38989831 is 13898983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38989831 - 2⁵ = 38989799 is a prime.

It is a super-2 number, since 2×38989831² = 3040413842817122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38989801) 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 in 3 ways as a sum of consecutive naturals, for example, 234796 + ... + 234961.

It is an arithmetic number, because the mean of its divisors is an integer number (9864918).

Almost surely, 2^38989831 is an apocalyptic number.

38989831 is a deficient number, since it is larger than the sum of its proper divisors (469841).

38989831 is an equidigital number, since it uses as much as digits as its factorization.

38989831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469840.

The product of its digits is 373248, while the sum is 49.

The square root of 38989831 is about 6244.1837737209. The cubic root of 38989831 is about 339.0916671844.

The spelling of 38989831 in words is "thirty-eight million, nine hundred eighty-nine thousand, eight hundred thirty-one".