39951887387 has 4 divisors (see below), whose sum is σ = 40082024136. Its totient is φ = 39821750640.

The previous prime is 39951887383. The next prime is 39951887389. The reversal of 39951887387 is 78378815993.

It is a happy number.

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 39951887387 - 2² = 39951887383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39951887383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65067914 + ... + 65068527.

It is an arithmetic number, because the mean of its divisors is an integer number (10020506034).

Almost surely, 2^39951887387 is an apocalyptic number.

39951887387 is a deficient number, since it is larger than the sum of its proper divisors (130136749).

39951887387 is a wasteful number, since it uses less digits than its factorization.

39951887387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130136748.

The product of its digits is 91445760, while the sum is 68.

The spelling of 39951887387 in words is "thirty-nine billion, nine hundred fifty-one million, eight hundred eighty-seven thousand, three hundred eighty-seven".