215212842 has 64 divisors (see below), whose sum is σ = 517345920. Its totient is φ = 65923200.

The previous prime is 215212841. The next prime is 215212849. The reversal of 215212842 is 248212512.

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

It is not an unprimeable number, because it can be changed into a prime (215212841) 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, 196717 + ... + 197807.

It is an arithmetic number, because the mean of its divisors is an integer number (8083530).

Almost surely, 2^215212842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215212842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258672960).

215212842 is an abundant number, since it is smaller than the sum of its proper divisors (302133078).

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

215212842 is a wasteful number, since it uses less digits than its factorization.

215212842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396 (or 1390 counting only the distinct ones).

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

The square root of 215212842 is about 14670.1343552130. The cubic root of 215212842 is about 599.2702628326.

The spelling of 215212842 in words is "two hundred fifteen million, two hundred twelve thousand, eight hundred forty-two".