215185420 has 12 divisors (see below), whose sum is σ = 451889424. Its totient is φ = 86074160.

The previous prime is 215185409. The next prime is 215185427. The reversal of 215185420 is 24581512.

It is not an unprimeable number, because it can be changed into a prime (215185427) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5379616 + ... + 5379655.

It is an arithmetic number, because the mean of its divisors is an integer number (37657452).

Almost surely, 2^215185420 is an apocalyptic number.

215185420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215185420 is an abundant number, since it is smaller than the sum of its proper divisors (236704004).

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

215185420 is a wasteful number, since it uses less digits than its factorization.

215185420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10759280 (or 10759278 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 215185420 is about 14669.1997055054. The cubic root of 215185420 is about 599.2448091360.

It can be divided in two parts, 2151 and 85420, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 215185420 in words is "two hundred fifteen million, one hundred eighty-five thousand, four hundred twenty".