215677983 has 16 divisors (see below), whose sum is σ = 291073536. Its totient is φ = 142041120.

The previous prime is 215677939. The next prime is 215677993. The reversal of 215677983 is 389776512.

It is not a de Polignac number, because 215677983 - 2¹³ = 215669791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215677933) 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, 208678 + ... + 209708.

It is an arithmetic number, because the mean of its divisors is an integer number (18192096).

Almost surely, 2^215677983 is an apocalyptic number.

215677983 is a deficient number, since it is larger than the sum of its proper divisors (75395553).

215677983 is a wasteful number, since it uses less digits than its factorization.

215677983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814.

The product of its digits is 635040, while the sum is 48.

The square root of 215677983 is about 14685.9791297686. The cubic root of 215677983 is about 599.7016878188.

The spelling of 215677983 in words is "two hundred fifteen million, six hundred seventy-seven thousand, nine hundred eighty-three".