1520785449 has 40 divisors (see below), whose sum is σ = 2318298048. Its totient is φ = 993241440.

The previous prime is 1520785417. The next prime is 1520785459. The reversal of 1520785449 is 9445870251.

1520785449 is a `hidden beast` number, since 1 + 520 + 7 + 85 + 4 + 49 = 666.

It is not a de Polignac number, because 1520785449 - 2⁵ = 1520785417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1520785459) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1714084 + ... + 1714970.

Almost surely, 2^1520785449 is an apocalyptic number.

It is an amenable number.

1520785449 is a deficient number, since it is larger than the sum of its proper divisors (797512599).

1520785449 is an equidigital number, since it uses as much as digits as its factorization.

1520785449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 1520785449 is about 38997.2492491458. The cubic root of 1520785449 is about 1149.9774284165.

The spelling of 1520785449 in words is "one billion, five hundred twenty million, seven hundred eighty-five thousand, four hundred forty-nine".