215423540 has 12 divisors (see below), whose sum is σ = 452389476. Its totient is φ = 86169408.

The previous prime is 215423519. The next prime is 215423581. The reversal of 215423540 is 45324512.

It is a happy number.

215423540 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 32741284 + 182682256 = 5722^2 + 13516^2 .

It is a super-2 number, since 2×215423540² = 92814603172263200, which contains 22 as substring.

It is a congruent number.

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, 5385569 + ... + 5385608.

It is an arithmetic number, because the mean of its divisors is an integer number (37699123).

Almost surely, 2^215423540 is an apocalyptic number.

215423540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215423540 is an abundant number, since it is smaller than the sum of its proper divisors (236965936).

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

215423540 is a wasteful number, since it uses less digits than its factorization.

215423540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771186 (or 10771184 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 215423540 is about 14677.3137869298. The cubic root of 215423540 is about 599.4657652039.

The spelling of 215423540 in words is "two hundred fifteen million, four hundred twenty-three thousand, five hundred forty".