39987798 has 16 divisors (see below), whose sum is σ = 80552640. Its totient is φ = 13233096.

The previous prime is 39987797. The next prime is 39987803. The reversal of 39987798 is 89778993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39987797) 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, 23140 + ... + 24807.

It is an arithmetic number, because the mean of its divisors is an integer number (5034540).

Almost surely, 2^39987798 is an apocalyptic number.

39987798 is an abundant number, since it is smaller than the sum of its proper divisors (40564842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39987798 is a wasteful number, since it uses less digits than its factorization.

39987798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48091.

The product of its digits is 6858432, while the sum is 60.

The square root of 39987798 is about 6323.5905939585. The cubic root of 39987798 is about 341.9604105878.

The spelling of 39987798 in words is "thirty-nine million, nine hundred eighty-seven thousand, seven hundred ninety-eight".