215940984 has 64 divisors (see below), whose sum is σ = 619107840. Its totient is φ = 61484160.

The previous prime is 215940979. The next prime is 215941031. The reversal of 215940984 is 489049512.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 50182 + ... + 54314.

It is an arithmetic number, because the mean of its divisors is an integer number (9673560).

Almost surely, 2^215940984 is an apocalyptic number.

215940984 is a gapful number since it is divisible by the number (24) 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 215940984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309553920).

215940984 is an abundant number, since it is smaller than the sum of its proper divisors (403166856).

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

215940984 is a wasteful number, since it uses less digits than its factorization.

215940984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460 (or 4456 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 215940984 is about 14694.9305544463. The cubic root of 215940984 is about 599.9453505781.

The spelling of 215940984 in words is "two hundred fifteen million, nine hundred forty thousand, nine hundred eighty-four".