215520146 has 16 divisors (see below), whose sum is σ = 325721088. Its totient is φ = 106950000.

The previous prime is 215520133. The next prime is 215520157. The reversal of 215520146 is 641025512.

It is a super-2 number, since 2×215520146² = 92897866663722632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186671 + ... + 187821.

It is an arithmetic number, because the mean of its divisors is an integer number (20357568).

Almost surely, 2^215520146 is an apocalyptic number.

215520146 is a deficient number, since it is larger than the sum of its proper divisors (110200942).

215520146 is a wasteful number, since it uses less digits than its factorization.

215520146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 215520146 is about 14680.6044153502. The cubic root of 215520146 is about 599.5553613162. Note that the first 3 decimals are identical.

Adding to 215520146 its reverse (641025512), we get a palindrome (856545658).

The spelling of 215520146 in words is "two hundred fifteen million, five hundred twenty thousand, one hundred forty-six".