215025440 has 96 divisors (see below), whose sum is σ = 586051200. Its totient is φ = 73027584.

The previous prime is 215025431. The next prime is 215025449. The reversal of 215025440 is 44520512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (215025431) and next prime (215025449).

It is not an unprimeable number, because it can be changed into a prime (215025449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125711 + ... + 127409.

It is an arithmetic number, because the mean of its divisors is an integer number (6104700).

Almost surely, 2^215025440 is an apocalyptic number.

215025440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215025440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293025600).

215025440 is an abundant number, since it is smaller than the sum of its proper divisors (371025760).

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

215025440 is a wasteful number, since it uses less digits than its factorization.

215025440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834 (or 1826 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 215025440 is about 14663.7457697547. The cubic root of 215025440 is about 599.0962690972.

Adding to 215025440 its reverse (44520512), we get a palindrome (259545952).

The spelling of 215025440 in words is "two hundred fifteen million, twenty-five thousand, four hundred forty".