215516040 has 32 divisors (see below), whose sum is σ = 646548480. Its totient is φ = 57470912.

The previous prime is 215516039. The next prime is 215516047. The reversal of 215516040 is 40615512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 215516040.

It is not an unprimeable number, because it can be changed into a prime (215516047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 897864 + ... + 898103.

It is an arithmetic number, because the mean of its divisors is an integer number (20204640).

Almost surely, 2^215516040 is an apocalyptic number.

215516040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215516040 is an abundant number, since it is smaller than the sum of its proper divisors (431032440).

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

215516040 is a wasteful number, since it uses less digits than its factorization.

215516040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795981 (or 1795977 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 215516040 is about 14680.4645703057. The cubic root of 215516040 is about 599.5515537991.

The spelling of 215516040 in words is "two hundred fifteen million, five hundred sixteen thousand, forty".