1520268385 has 4 divisors (see below), whose sum is σ = 1824322068. Its totient is φ = 1216214704.

The previous prime is 1520268353. The next prime is 1520268389. The reversal of 1520268385 is 5838620251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5838620251 = 263 ⋅22200077.

It can be written as a sum of positive squares in 2 ways, for example, as 757845841 + 762422544 = 27529^2 + 27612^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520268385 - 2⁵ = 1520268353 is a prime.

It is a super-2 number, since 2×1520268385² = 4622431924861016450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1520268389) 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, 152026834 + ... + 152026843.

It is an arithmetic number, because the mean of its divisors is an integer number (456080517).

Almost surely, 2^1520268385 is an apocalyptic number.

It is an amenable number.

1520268385 is a deficient number, since it is larger than the sum of its proper divisors (304053683).

1520268385 is an equidigital number, since it uses as much as digits as its factorization.

1520268385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304053682.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 1520268385 is about 38990.6191923134. The cubic root of 1520268385 is about 1149.8470836373.

The spelling of 1520268385 in words is "one billion, five hundred twenty million, two hundred sixty-eight thousand, three hundred eighty-five".