1609381870 has 16 divisors (see below), whose sum is σ = 2897360928. Its totient is φ = 643647520.

The previous prime is 1609381867. The next prime is 1609381877. The reversal of 1609381870 is 781839061.

It is a super-4 number, since 4×1609381870⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609381877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88455 + ... + 105085.

It is an arithmetic number, because the mean of its divisors is an integer number (181085058).

Almost surely, 2^1609381870 is an apocalyptic number.

1609381870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1609381870 is a deficient number, since it is larger than the sum of its proper divisors (1287979058).

1609381870 is a wasteful number, since it uses less digits than its factorization.

1609381870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26315.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1609381870 is about 40117.1019641250. The cubic root of 1609381870 is about 1171.8887044039. Note that the first 3 decimals are identical.

The spelling of 1609381870 in words is "one billion, six hundred nine million, three hundred eighty-one thousand, eight hundred seventy".