1686970947 has 4 divisors (see below), whose sum is σ = 2249294600. Its totient is φ = 1124647296.

The previous prime is 1686970937. The next prime is 1686970951. The reversal of 1686970947 is 7490796861.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1686970947 - 2¹⁶ = 1686905411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1686970937) 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, 281161822 + ... + 281161827.

It is an arithmetic number, because the mean of its divisors is an integer number (562323650).

Almost surely, 2^1686970947 is an apocalyptic number.

1686970947 is a deficient number, since it is larger than the sum of its proper divisors (562323653).

1686970947 is an equidigital number, since it uses as much as digits as its factorization.

1686970947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562323652.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 1686970947 is about 41072.7518800482. The cubic root of 1686970947 is about 1190.4263582993.

The spelling of 1686970947 in words is "one billion, six hundred eighty-six million, nine hundred seventy thousand, nine hundred forty-seven".