1986947807 has 4 divisors (see below), whose sum is σ = 2139789960. Its totient is φ = 1834105656.

The previous prime is 1986947761. The next prime is 1986947839. The reversal of 1986947807 is 7087496891.

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 1986947807 - 2⁸ = 1986947551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986947107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76421057 + ... + 76421082.

It is an arithmetic number, because the mean of its divisors is an integer number (534947490).

Almost surely, 2^1986947807 is an apocalyptic number.

1986947807 is a deficient number, since it is larger than the sum of its proper divisors (152842153).

1986947807 is a wasteful number, since it uses less digits than its factorization.

1986947807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152842152.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The square root of 1986947807 is about 44575.1927309350. The cubic root of 1986947807 is about 1257.1742771817.

It can be divided in two parts, 19869 and 47807, that added together give a palindrome (67676).

The spelling of 1986947807 in words is "one billion, nine hundred eighty-six million, nine hundred forty-seven thousand, eight hundred seven".