1520221986 has 16 divisors (see below), whose sum is σ = 3378271200. Its totient is φ = 506740644.

The previous prime is 1520221897. The next prime is 1520221987. The reversal of 1520221986 is 6891220251.

It is a super-2 number, since 2×1520221986² = 4622149773435568392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1520221986.

It is not an unprimeable number, because it can be changed into a prime (1520221987) 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 7 ways as a sum of consecutive naturals, for example, 14076076 + ... + 14076183.

It is an arithmetic number, because the mean of its divisors is an integer number (211141950).

Almost surely, 2^1520221986 is an apocalyptic number.

1520221986 is an abundant number, since it is smaller than the sum of its proper divisors (1858049214).

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

1520221986 is a wasteful number, since it uses less digits than its factorization.

1520221986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28152270 (or 28152264 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1520221986 is about 38990.0241856811. The cubic root of 1520221986 is about 1149.8353856375.

The spelling of 1520221986 in words is "one billion, five hundred twenty million, two hundred twenty-one thousand, nine hundred eighty-six".