39333981 has 4 divisors (see below), whose sum is σ = 52445312. Its totient is φ = 26222652.

The previous prime is 39333941. The next prime is 39333989. The reversal of 39333981 is 18933393.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 39333981 - 2¹¹ = 39331933 is a prime.

It is a super-2 number, since 2×39333981² = 3094324122616722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39333989) 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, 6555661 + ... + 6555666.

It is an arithmetic number, because the mean of its divisors is an integer number (13111328).

Almost surely, 2^39333981 is an apocalyptic number.

It is an amenable number.

39333981 is a deficient number, since it is larger than the sum of its proper divisors (13111331).

39333981 is a wasteful number, since it uses less digits than its factorization.

39333981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13111330.

The product of its digits is 52488, while the sum is 39.

The square root of 39333981 is about 6271.6808751721. The cubic root of 39333981 is about 340.0864284316.

The spelling of 39333981 in words is "thirty-nine million, three hundred thirty-three thousand, nine hundred eighty-one".