39387981 has 8 divisors (see below), whose sum is σ = 52580320. Its totient is φ = 26227152.

The previous prime is 39387967. The next prime is 39387989. The reversal of 39387981 is 18978393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39387981 - 2⁷ = 39387853 is a prime.

It is a super-2 number, since 2×39387981² = 3102826094512722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39387981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39387989) 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 7 ways as a sum of consecutive naturals, for example, 4786 + ... + 10083.

It is an arithmetic number, because the mean of its divisors is an integer number (6572540).

Almost surely, 2^39387981 is an apocalyptic number.

It is an amenable number.

39387981 is a deficient number, since it is larger than the sum of its proper divisors (13192339).

39387981 is a wasteful number, since it uses less digits than its factorization.

39387981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15755.

The product of its digits is 326592, while the sum is 48.

The square root of 39387981 is about 6275.9844646079. The cubic root of 39387981 is about 340.2419874762.

The spelling of 39387981 in words is "thirty-nine million, three hundred eighty-seven thousand, nine hundred eighty-one".