215451140 has 12 divisors (see below), whose sum is σ = 452447436. Its totient is φ = 86180448.

The previous prime is 215451109. The next prime is 215451161. The reversal of 215451140 is 41154512.

It can be written as a sum of positive squares in 2 ways, for example, as 147816964 + 67634176 = 12158^2 + 8224^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5386259 + ... + 5386298.

It is an arithmetic number, because the mean of its divisors is an integer number (37703953).

Almost surely, 2^215451140 is an apocalyptic number.

215451140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215451140 is an abundant number, since it is smaller than the sum of its proper divisors (236996296).

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

215451140 is a wasteful number, since it uses less digits than its factorization.

215451140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10772566 (or 10772564 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 215451140 is about 14678.2539833592. The cubic root of 215451140 is about 599.4913652359.

The spelling of 215451140 in words is "two hundred fifteen million, four hundred fifty-one thousand, one hundred forty".