1785499945 has 4 divisors (see below), whose sum is σ = 2142599940. Its totient is φ = 1428399952.

The previous prime is 1785499943. The next prime is 1785499979. The reversal of 1785499945 is 5499945871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 247369984 + 1538129961 = 15728^2 + 39219^2 .

It is a cyclic number.

It is not a de Polignac number, because 1785499945 - 2¹ = 1785499943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1785499943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178549990 + ... + 178549999.

It is an arithmetic number, because the mean of its divisors is an integer number (535649985).

Almost surely, 2^1785499945 is an apocalyptic number.

It is an amenable number.

1785499945 is a deficient number, since it is larger than the sum of its proper divisors (357099995).

1785499945 is an equidigital number, since it uses as much as digits as its factorization.

1785499945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357099994.

The product of its digits is 16329600, while the sum is 61.

The square root of 1785499945 is about 42255.1765467854. The cubic root of 1785499945 is about 1213.1652086533.

The spelling of 1785499945 in words is "one billion, seven hundred eighty-five million, four hundred ninety-nine thousand, nine hundred forty-five".