215105440 has 48 divisors (see below), whose sum is σ = 554389920. Its totient is φ = 78219520.

The previous prime is 215105431. The next prime is 215105467. The reversal of 215105440 is 44501512.

215105440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×215105440³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59350 + ... + 62869.

It is an arithmetic number, because the mean of its divisors is an integer number (11549790).

Almost surely, 2^215105440 is an apocalyptic number.

215105440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215105440 is an abundant number, since it is smaller than the sum of its proper divisors (339284480).

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

215105440 is a wasteful number, since it uses less digits than its factorization.

215105440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122245 (or 122237 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215105440 is about 14666.4733320591. The cubic root of 215105440 is about 599.1705576076.

Adding to 215105440 its reverse (44501512), we get a palindrome (259606952).

The spelling of 215105440 in words is "two hundred fifteen million, one hundred five thousand, four hundred forty".