215678493 has 12 divisors (see below), whose sum is σ = 316643548. Its totient is φ = 141428160.

The previous prime is 215678471. The next prime is 215678549. The reversal of 215678493 is 394876512.

215678493 is a `hidden beast` number, since 2 + 1 + 567 + 84 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107060409 + 108618084 = 10347^2 + 10422^2 .

It is not a de Polignac number, because 215678493 - 2⁵ = 215678461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215678413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195880 + ... + 196977.

Almost surely, 2^215678493 is an apocalyptic number.

It is an amenable number.

215678493 is a deficient number, since it is larger than the sum of its proper divisors (100965055).

215678493 is a wasteful number, since it uses less digits than its factorization.

215678493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392924 (or 392921 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 215678493 is about 14685.9964932585. The cubic root of 215678493 is about 599.7021605105.

The spelling of 215678493 in words is "two hundred fifteen million, six hundred seventy-eight thousand, four hundred ninety-three".