215241840 has 160 divisors (see below), whose sum is σ = 808876800. Its totient is φ = 52174080.

The previous prime is 215241827. The next prime is 215241847. The reversal of 215241840 is 48142512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215241847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19231 + ... + 28289.

It is an arithmetic number, because the mean of its divisors is an integer number (5055480).

Almost surely, 2^215241840 is an apocalyptic number.

215241840 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 215241840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404438400).

215241840 is an abundant number, since it is smaller than the sum of its proper divisors (593634960).

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

215241840 is a wasteful number, since it uses less digits than its factorization.

215241840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9092 (or 9080 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 215241840 is about 14671.1226564295. The cubic root of 215241840 is about 599.2971770546.

The spelling of 215241840 in words is "two hundred fifteen million, two hundred forty-one thousand, eight hundred forty".