1913890687 has 4 divisors (see below), whose sum is σ = 1919106016. Its totient is φ = 1908675360.

The previous prime is 1913890673. The next prime is 1913890721. The reversal of 1913890687 is 7860983191.

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 1913890687 - 2¹⁵ = 1913857919 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 (1913890637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2607114 + ... + 2607847.

It is an arithmetic number, because the mean of its divisors is an integer number (479776504).

Almost surely, 2^1913890687 is an apocalyptic number.

1913890687 is a deficient number, since it is larger than the sum of its proper divisors (5215329).

1913890687 is an equidigital number, since it uses as much as digits as its factorization.

1913890687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5215328.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1913890687 is about 43748.0363787908. The cubic root of 1913890687 is about 1241.5733339172.

The spelling of 1913890687 in words is "one billion, nine hundred thirteen million, eight hundred ninety thousand, six hundred eighty-seven".