1916381564 has 12 divisors (see below), whose sum is σ = 3375029784. Its totient is φ = 952087344.

The previous prime is 1916381543. The next prime is 1916381569. The reversal of 1916381564 is 4651836191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916381569) 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, 1525154 + ... + 1526409.

It is an arithmetic number, because the mean of its divisors is an integer number (281252482).

Almost surely, 2^1916381564 is an apocalyptic number.

It is an amenable number.

1916381564 is a deficient number, since it is larger than the sum of its proper divisors (1458648220).

1916381564 is a wasteful number, since it uses less digits than its factorization.

1916381564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3051724 (or 3051722 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 1916381564 is about 43776.4955655429. The cubic root of 1916381564 is about 1242.1117251297. Note that the first 3 decimals are identical.

The spelling of 1916381564 in words is "one billion, nine hundred sixteen million, three hundred eighty-one thousand, five hundred sixty-four".