215390 has 32 divisors (see below), whose sum is σ = 471744. Its totient is φ = 69120.

The previous prime is 215389. The next prime is 215393. The reversal of 215390 is 93512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215393) 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, 1100 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (14742).

2²¹⁵³⁹⁰ is an apocalyptic number.

215390 is an abundant number, since it is smaller than the sum of its proper divisors (256354).

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

215390 is a wasteful number, since it uses less digits than its factorization.

215390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 215390 is about 464.1012820495. The cubic root of 215390 is about 59.9434652656.

The spelling of 215390 in words is "two hundred fifteen thousand, three hundred ninety".