39981115 has 8 divisors (see below), whose sum is σ = 48179520. Its totient is φ = 31850112.

The previous prime is 39981101. The next prime is 39981119. The reversal of 39981115 is 51118993.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 39981115 - 2⁵ = 39981083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39981119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15534 + ... + 17923.

It is an arithmetic number, because the mean of its divisors is an integer number (6022440).

Almost surely, 2^39981115 is an apocalyptic number.

39981115 is a deficient number, since it is larger than the sum of its proper divisors (8198405).

39981115 is a wasteful number, since it uses less digits than its factorization.

39981115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33701.

The product of its digits is 9720, while the sum is 37.

The square root of 39981115 is about 6323.0621537353. The cubic root of 39981115 is about 341.9413593700.

The spelling of 39981115 in words is "thirty-nine million, nine hundred eighty-one thousand, one hundred fifteen".