215740 has 48 divisors (see below), whose sum is σ = 548352. Its totient is φ = 69696.

The previous prime is 215737. The next prime is 215753. The reversal of 215740 is 47512.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3187 + ... + 3253.

It is an arithmetic number, because the mean of its divisors is an integer number (11424).

2²¹⁵⁷⁴⁰ is an apocalyptic number.

215740 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 215740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274176).

215740 is an abundant number, since it is smaller than the sum of its proper divisors (332612).

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

215740 is a wasteful number, since it uses less digits than its factorization.

215740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 215740 is about 464.4782018567. The cubic root of 215740 is about 59.9759162601.

It can be divided in two parts, 2157 and 40, that added together give a cube (2197 = 13³).

The spelling of 215740 in words is "two hundred fifteen thousand, seven hundred forty".