1985217215 has 16 divisors (see below), whose sum is σ = 2461912320. Its totient is φ = 1535189760.

The previous prime is 1985217197. The next prime is 1985217217. The reversal of 1985217215 is 5127125891.

It is not a de Polignac number, because 1985217215 - 2⁶ = 1985217151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985217217) 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, 138401 + ... + 152069.

It is an arithmetic number, because the mean of its divisors is an integer number (153869520).

Almost surely, 2^1985217215 is an apocalyptic number.

1985217215 is a deficient number, since it is larger than the sum of its proper divisors (476695105).

1985217215 is a wasteful number, since it uses less digits than its factorization.

1985217215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14642.

The product of its digits is 50400, while the sum is 41.

The square root of 1985217215 is about 44555.7764493000. The cubic root of 1985217215 is about 1256.8091799044.

The spelling of 1985217215 in words is "one billion, nine hundred eighty-five million, two hundred seventeen thousand, two hundred fifteen".