1604644243 has 8 divisors (see below), whose sum is σ = 1680334848. Its totient is φ = 1529447304.

The previous prime is 1604644213. The next prime is 1604644273. The reversal of 1604644243 is 3424464061.

It is an interprime number because it is at equal distance from previous prime (1604644213) and next prime (1604644273).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604644243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1604644199 and 1604644208.

It is not an unprimeable number, because it can be changed into a prime (1604644213) 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 7 ways as a sum of consecutive naturals, for example, 116755 + ... + 129772.

It is an arithmetic number, because the mean of its divisors is an integer number (210041856).

Almost surely, 2^1604644243 is an apocalyptic number.

1604644243 is a deficient number, since it is larger than the sum of its proper divisors (75690605).

1604644243 is a wasteful number, since it uses less digits than its factorization.

1604644243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246833.

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 1604644243 is about 40058.0109715897. The cubic root of 1604644243 is about 1170.7376561908.

The spelling of 1604644243 in words is "one billion, six hundred four million, six hundred forty-four thousand, two hundred forty-three".