1609994520 has 96 divisors (see below), whose sum is σ = 5540296320. Its totient is φ = 404075520.

The previous prime is 1609994513. The next prime is 1609994527. The reversal of 1609994520 is 254999061.

It is an interprime number because it is at equal distance from previous prime (1609994513) and next prime (1609994527).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609994527) 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 23 ways as a sum of consecutive naturals, for example, 125416 + ... + 137655.

It is an arithmetic number, because the mean of its divisors is an integer number (57711420).

Almost surely, 2^1609994520 is an apocalyptic number.

1609994520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1609994520 is an abundant number, since it is smaller than the sum of its proper divisors (3930301800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1609994520 is a wasteful number, since it uses less digits than its factorization.

1609994520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263105 (or 263098 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 1609994520 is about 40124.7370084839. The cubic root of 1609994520 is about 1172.0373880993.

The spelling of 1609994520 in words is "one billion, six hundred nine million, nine hundred ninety-four thousand, five hundred twenty".